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The IRA’s recoilless improvised grenade launcher - The Firearm Blog

The Projected Recoilless Improvised Grenade (PRIG) was a shoulder fired weapon developed by the Provisional Irish Republican Army (PIRA) for use against lightly armored vehicles. It is perhaps the most ingenious example of kitchen cupboard improvisation to date.

projectedimprovisedgrenadelauncher2prigbox1

The launcher consisted of a length of steel tube adapted to accept a charge of black powder in the middle by way of a capped off perforated pipe welded in place. The charge is wired to a simple circuit, often utilizing a light bulb holder as an arming switch and fired by a long arm micro-switch which serves as a trigger.

improvisedrecoillesslaunchers1iraprig

From ‘Improvised Home-Built Recoilless Launchers’ – Paladin Press

The warhead itself consists of a standard food tin filled with 600g of Semtex, complete with a frontal explosive lens to create an armor piercing shaped charge. This round was designed to explode on impact, being an adaption of an earlier used improvised stick-grenade known as a ‘drogue bomb’ which was sometimes fitted with a trash bag to act as a guide parachute.

prg4

To the rear of the launcher was placed the ‘counter-shot’, incorporated to utilize the recoilless principle (Reduced to as little as a .22lr rifle’s, according to some!). This consisted of two packets of digestive tea biscuits, wrapped in j-cloth…. an interesting forensic aftermath of course ensues!

DSC00029

This weapon was used in at least eleven attacks during the early 1990s, and can often be seen touted out in IRA training footage.

IRApriglauncher

UE-120-9A more compact variation:

ira3

irarecoillessgrenadelauncher3

A further simplified version trialled in the book ‘Improvised Home-built Recoilless Launchers’:

improvisedrecoillesslauncher2

An earlier attempt at a clandestinely produced launcher was the Mark-12 IPG (Improvised Projected Grenade). A downside to this design was that the shoulder bruises incurred after firing apparently had the side effect of aiding the authorities in identifying the shooter if he were searched.

IRAimprovisedprojectedgrenadelauncher

iraimprovisedlaunchers

The pinnacle mortar development in the IRA’s arsenal was the Mark-15 ‘Barrack Buster’ – a large Calor propane gas cylinder adapted to fire a smaller cylinder filled with up to 100kg of explosive material. This model was used to bring down two British army helicopters and was occasionally fired in batteries of up to 12 units.

Barrack_buster_feb_2010

irabarrackbuster2

- See more at: http://www.thefirearmblog.com/blog/2014/10/13/iras-recoilless-improvised-grenade-launcher/?utm_source=feedly&utm_reader=feedly&utm_medium=rss&utm_campaign=rss#sthash.IFtwo9D6.dpuf

Enfield L85A2 
Serial, NSN and Designation:The serial is stamped, but the rest is just painted on.Receiver HK A2 logo (top, just before the buttplate):Gas block HK A2 markings (these seem to be missing or fade away on most weapons):Gas plug setting stamps:Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as wellChange lever setting stamps R for Repetition (semi-automatic) and A for Automatic:Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock) Enfield L85A2 
Serial, NSN and Designation:The serial is stamped, but the rest is just painted on.Receiver HK A2 logo (top, just before the buttplate):Gas block HK A2 markings (these seem to be missing or fade away on most weapons):Gas plug setting stamps:Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as wellChange lever setting stamps R for Repetition (semi-automatic) and A for Automatic:Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock) Enfield L85A2 
Serial, NSN and Designation:The serial is stamped, but the rest is just painted on.Receiver HK A2 logo (top, just before the buttplate):Gas block HK A2 markings (these seem to be missing or fade away on most weapons):Gas plug setting stamps:Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as wellChange lever setting stamps R for Repetition (semi-automatic) and A for Automatic:Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock) Enfield L85A2 
Serial, NSN and Designation:The serial is stamped, but the rest is just painted on.Receiver HK A2 logo (top, just before the buttplate):Gas block HK A2 markings (these seem to be missing or fade away on most weapons):Gas plug setting stamps:Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as wellChange lever setting stamps R for Repetition (semi-automatic) and A for Automatic:Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock) Enfield L85A2 
Serial, NSN and Designation:The serial is stamped, but the rest is just painted on.Receiver HK A2 logo (top, just before the buttplate):Gas block HK A2 markings (these seem to be missing or fade away on most weapons):Gas plug setting stamps:Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as wellChange lever setting stamps R for Repetition (semi-automatic) and A for Automatic:Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock)

Enfield L85A2 

Serial, NSN and Designation:
The serial is stamped, but the rest is just painted on.

Receiver HK A2 logo (top, just before the buttplate):

Gas block HK A2 markings (these seem to be missing or fade away on most weapons):

Gas plug setting stamps:

Note in the first pic showing the Serial etc. you can also see a letter J stamped into the top of the gas block as well

Change lever setting stamps R for Repetition (semi-automatic) and A for Automatic:

Also notice the HK markings on the TMH rear locking pin (the big circular pin just before the buttstock)


Meow!

Meow!

Meow!

Meow!

Meow!
ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book). ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book).

ca-tsuka:

Artworks of Meka Chan project by italian artist Claudio Acciari (he made a fake opening, and he also works on a comic book).

Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again. Modified M79? - M79 [REF] - U.S. Militaria Forum
Cool photo of the T148E1s. First time I’ve seen that many together in one image.As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again.

Modified M79? - M79 [REF] - U.S. Militaria Forum

Cool photo of the T148E1s. First time I’ve seen that many together in one image.

As noted in the display card in museum photo, the T148E1 pre-dated the M79 and was the preferred design to launch the 40mm grenades developed a few years earlier. They felt the multi-shot launcher would provide superior firepower compared to the single-shot XM-79 and set up an experimental production run to work out the manufacturing bugs. Not sure about the total number produced but recall it was around 300 units.

In testing, the unfortunate flaws of the harmonica feed design were discovered. The constant-force spring used to advance the feed block often failed to correctly locate the chamber for the next round. The gap between feed block and barrel allowed uneven gas venting and velocity variations from round to round. The greatest problem was simply the two big open chambers sticking out the side of the launcher that got fouled with sticks, mud, and other debris when carried in the field. So they were shelved in favor of the simpler single-shot XM79.

The T148E1 still wasn’t dead at that point, though. Complaints came in from Vietnam requesting a 40mm launcher with greater firepower than the M79. With several hundred T148E1s in storage, a maintenance manual was quickly printed at Rock Island Arsenal in 1966 and a bunch of them were sent to Vietnam for field testing. Of course, once they got out in the bush, all the old problems came back and were confirmed all over again.

Springfield Armory Museum - Collection Record
U.S. SUBMACHINE GUN M2 .45ACP SN# 226
Manufactured by Marlin Firearms Co., New Haven, Ct. in 1943 - Standard M2 submachine gun. Blowback-operated, selective-fire. Fires from open bolt. 4-groove rifling; right hand twist. Full wooden stock with pistol grip and upper handguard. Blade front; fixed aperture rear sight with a ‘U’ notch. Muzzle velocity 960 fps. Cyclic rate of fire 500 rpm. Weapon weighs 9.25 lbs. unloaded, and 11.15 lbs. loaded. Fed by 20 or 30-round Thompson box magazines. Designed as substitute for Thompson, but by time it went into production the M3 had been adopted. Complete with magazine and sling. Only 400 of these were manufactured. Springfield Armory Museum - Collection Record
U.S. SUBMACHINE GUN M2 .45ACP SN# 226
Manufactured by Marlin Firearms Co., New Haven, Ct. in 1943 - Standard M2 submachine gun. Blowback-operated, selective-fire. Fires from open bolt. 4-groove rifling; right hand twist. Full wooden stock with pistol grip and upper handguard. Blade front; fixed aperture rear sight with a ‘U’ notch. Muzzle velocity 960 fps. Cyclic rate of fire 500 rpm. Weapon weighs 9.25 lbs. unloaded, and 11.15 lbs. loaded. Fed by 20 or 30-round Thompson box magazines. Designed as substitute for Thompson, but by time it went into production the M3 had been adopted. Complete with magazine and sling. Only 400 of these were manufactured.

Springfield Armory Museum - Collection Record

U.S. SUBMACHINE GUN M2 .45ACP SN# 226

Manufactured by Marlin Firearms Co., New Haven, Ct. in 1943 - Standard M2 submachine gun. Blowback-operated, selective-fire. Fires from open bolt. 4-groove rifling; right hand twist. Full wooden stock with pistol grip and upper handguard. Blade front; fixed aperture rear sight with a ‘U’ notch. Muzzle velocity 960 fps. Cyclic rate of fire 500 rpm. Weapon weighs 9.25 lbs. unloaded, and 11.15 lbs. loaded. Fed by 20 or 30-round Thompson box magazines. Designed as substitute for Thompson, but by time it went into production the M3 had been adopted. Complete with magazine and sling. Only 400 of these were manufactured.

Springfield Armory Museum - Collection Record
U.S. SUBMACHINE GUN M3 .45ACP
Manufactured by Guide Lamp Division of GM, Dayton, Oh. - Standard M3 submachine gun that has been fitted with experimental curved barrel. Barrel is rifled. Purpose of design was to protect personnel in armored vehicles when the enemy had penetrated blind areas on or near the vehicle and could not be engaged with vehicle mounted weapons. Weapon weighs approximately 8 lbs. Weapon has no housing around magazine catch release and the bolt is missing. Official paperwork indicates that weapon was tested, but we have not been able to find the test report. It is assumed, weapon did not test well. Springfield Armory Museum - Collection Record
U.S. SUBMACHINE GUN M3 .45ACP
Manufactured by Guide Lamp Division of GM, Dayton, Oh. - Standard M3 submachine gun that has been fitted with experimental curved barrel. Barrel is rifled. Purpose of design was to protect personnel in armored vehicles when the enemy had penetrated blind areas on or near the vehicle and could not be engaged with vehicle mounted weapons. Weapon weighs approximately 8 lbs. Weapon has no housing around magazine catch release and the bolt is missing. Official paperwork indicates that weapon was tested, but we have not been able to find the test report. It is assumed, weapon did not test well.

Springfield Armory Museum - Collection Record

U.S. SUBMACHINE GUN M3 .45ACP

Manufactured by Guide Lamp Division of GM, Dayton, Oh. - Standard M3 submachine gun that has been fitted with experimental curved barrel. Barrel is rifled. Purpose of design was to protect personnel in armored vehicles when the enemy had penetrated blind areas on or near the vehicle and could not be engaged with vehicle mounted weapons. Weapon weighs approximately 8 lbs. Weapon has no housing around magazine catch release and the bolt is missing. Official paperwork indicates that weapon was tested, but we have not been able to find the test report. It is assumed, weapon did not test well.

What’s this 1911-based frame… whatchamacallit? | WeaponsMan
Every once in a while, something comes along that does a pretty good Stump the Monkey on is. This is one of those. Collector/Dealer Bob Adams thinks it might have been some kind of a test fixture. Unknown device or test fixture possibly made from a ca. 1918 Colt 1911 frame. Fitted with what appears to be a large threaded ring. Equipped with two vertical uprights at the top of the ring and a hole on the left side. The grip safety has been replaced with a solid backstrap/mainspring housing. The non-functional half slide is not original to the device. There is no longer any provision for a breech locking mechanism, nor any way to secure a slide on the rails, so it could not function as a firearm. This appears to have been an unfinished or scrap frame extensively remanufactured into some unknown device or test fixture and is not a firearm. It may have been a fixture for testing hammer fall impact, or firing pin spring strength, firing pin protusion, What’s this 1911-based frame… whatchamacallit? | WeaponsMan
Every once in a while, something comes along that does a pretty good Stump the Monkey on is. This is one of those. Collector/Dealer Bob Adams thinks it might have been some kind of a test fixture. Unknown device or test fixture possibly made from a ca. 1918 Colt 1911 frame. Fitted with what appears to be a large threaded ring. Equipped with two vertical uprights at the top of the ring and a hole on the left side. The grip safety has been replaced with a solid backstrap/mainspring housing. The non-functional half slide is not original to the device. There is no longer any provision for a breech locking mechanism, nor any way to secure a slide on the rails, so it could not function as a firearm. This appears to have been an unfinished or scrap frame extensively remanufactured into some unknown device or test fixture and is not a firearm. It may have been a fixture for testing hammer fall impact, or firing pin spring strength, firing pin protusion, What’s this 1911-based frame… whatchamacallit? | WeaponsMan
Every once in a while, something comes along that does a pretty good Stump the Monkey on is. This is one of those. Collector/Dealer Bob Adams thinks it might have been some kind of a test fixture. Unknown device or test fixture possibly made from a ca. 1918 Colt 1911 frame. Fitted with what appears to be a large threaded ring. Equipped with two vertical uprights at the top of the ring and a hole on the left side. The grip safety has been replaced with a solid backstrap/mainspring housing. The non-functional half slide is not original to the device. There is no longer any provision for a breech locking mechanism, nor any way to secure a slide on the rails, so it could not function as a firearm. This appears to have been an unfinished or scrap frame extensively remanufactured into some unknown device or test fixture and is not a firearm. It may have been a fixture for testing hammer fall impact, or firing pin spring strength, firing pin protusion,

What’s this 1911-based frame… whatchamacallit? | WeaponsMan

Every once in a while, something comes along that does a pretty good Stump the Monkey on is. This is one of those. Collector/Dealer Bob Adams thinks it might have been some kind of a test fixture.
Unknown device or test fixture possibly made from a ca. 1918 Colt 1911 frame. Fitted with what appears to be a large threaded ring. Equipped with two vertical uprights at the top of the ring and a hole on the left side. The grip safety has been replaced with a solid backstrap/mainspring housing. The non-functional half slide is not original to the device. There is no longer any provision for a breech locking mechanism, nor any way to secure a slide on the rails, so it could not function as a firearm. This appears to have been an unfinished or scrap frame extensively remanufactured into some unknown device or test fixture and is not a firearm. It may have been a fixture for testing hammer fall impact, or firing pin spring strength, firing pin protusion,

Springfield Armory Museum - Collection Record
RIFLE, MILITARY -  U.S. RIFLE MODEL 1903 TEST DEVICE FOR .45ACP AMMUNITION
Manufactured by Springfield Armory, Springfield, Ma. - This is an Armory made device for testing .45ACP ammunition. Consists of a Springfield M1903 rifle action and stock to which has been fitted the frame and magazine of U.S. M1911 Pistol and a .45 caliber barrel. The ejector and ejector spring have been purposely removed. Weapon has no sights. Weapon complete and in good condition. Springfield Armory Museum - Collection Record
RIFLE, MILITARY -  U.S. RIFLE MODEL 1903 TEST DEVICE FOR .45ACP AMMUNITION
Manufactured by Springfield Armory, Springfield, Ma. - This is an Armory made device for testing .45ACP ammunition. Consists of a Springfield M1903 rifle action and stock to which has been fitted the frame and magazine of U.S. M1911 Pistol and a .45 caliber barrel. The ejector and ejector spring have been purposely removed. Weapon has no sights. Weapon complete and in good condition.

Springfield Armory Museum - Collection Record

RIFLE, MILITARY -  U.S. RIFLE MODEL 1903 TEST DEVICE FOR .45ACP AMMUNITION

Manufactured by Springfield Armory, Springfield, Ma. - This is an Armory made device for testing .45ACP ammunition. Consists of a Springfield M1903 rifle action and stock to which has been fitted the frame and magazine of U.S. M1911 Pistol and a .45 caliber barrel. The ejector and ejector spring have been purposely removed. Weapon has no sights. Weapon complete and in good condition.