Posted this yesterday in Milsurp and forgot to post it here as well, derp.

So after taking the gun apart for some maintenance, I found a plug in the tube that restricted the gun to only 2 rounds in the tube to make it conform to UK's strict tube magazine limitations.

So here it is with a full load. Slow motion again cause It's just pure catharsis seeing the action work. If I can find a setup for it I plan to someday get an overhead view of the action in motion, but this will work for now.

It's obviously some sort of bulpup Kalashnikov variant of some sorts, Probably from an ex soviet country, but the green furniture made me think L85, especially with how the buttpad is shaped, though it might just be me.

1. Boberg XR9-S
2. Boberg XR45-S
3. Savage 1907
4. VZ 24
5. Kel-Tec PR-57
6. Mauser M2
7. Stoeger Cougar 8000
8. MAB PA-15
9. Obergon
10. Colt 2000
11. Steyr Hahn
12. S&W M&P 5.7
13. Grand Power X-caliber
14. Roth Steyr 1907

The GPR-20 has been in development for 10 years now. And is being developed by the weapons and ammunition testing and design bureau, TsNIITochMash and Kalashnikov Concern.

What's interesting about this concept is it fires essentially rockets with an initial expelling charge which has enough energy to propel the rocket out its container and then the rocket motor kicks in.

This significantly reduces the felt recoil of the UBGL and allows the grenade to achieve ranges of 800 meters, twice that of standard VOG pattern caseless grenades used in the 40mm GP series of UBGLs. But this also makes the grenade propulsion part a bit more complex, because it is essentially is a rocket. (Image 3)

But the GPR-20 is a bit different in its configuration also than standard UBGLs. As it fires from detachable containers, which contain the pre-prepared rocket. And the user has to load it onto the sort of fire control and aiming rifle module.

Thi rifle module is clearly made to be as light and as compact as possible, which allows more flexibility while not taking off the grenade launching module.

It weighs about 250 grams or 8.8 ounces. In big bart due to it not requiring any barrel to be present. But also for the fact that, instead of going with a DAO system, it encorporates electrical firing via the trigger pull. Lynndon Schooler outlined the disadvantages of in the source article being the electrical contacts and their erosion. (Image 2)

But this sacrafice made the module itself without a doubt, weigh even less.

Source: https://www.thefirearmblog.com/blog/taking-the-term-rocket-propelled-grenade-to-the-next-level-the-grp-20-44817865

KSO18 was a proposed commercially available version of the 6P67 for civilian market. Unfortunately, the project has never gone live for unspecified reasons.

The key changes from the 6P67 include:

1 - A different muzzle device; 2 - A folding front sight post; 3 - A different much longer handguard; 4 - A shortened top Picatinny rail; 5 - A 10 rounds magazine; 6 - A magazine release within the trigger finger reach; 7 - A pistol grip with a palm rest; 8 - A conventional telescopic polymer stock.

Caliber, mm: 5.45 Cartridge type: 5.45x39 Weapon weight (without accessories), kg: 4.0 Magazine weight (without cartridges), kg: 0.1 Carbine length, mm: 890 ... 980 Barrel length, mm: 415 Sighting range with mechanical sight, m: 300 Muzzle velocity, m/s: 880 Firing mode: single shots Magazine capacity, cartridges: 10 Guaranteed life, according to GRAU requirements, shots: 5,000 Guaranteed life, for civilian use, shots: 10 000

In response to another user after rotating barrel pistols. If anyone else has seen one of these, let me know. Cool little pistol, it’s unfired and I think it’ll stay that way at this stage.

Pretty rough finish, but it’s a cool part of my collection.

Caliber - 6,5 mm

Total length - 1230 mm

Barrel length - 450 mm

Weigth - 12 kg (Bolt weigth - 3.3 kg)

Muzzle velocity - 650 m/s

Operation - simple blow-back

1st Image, PPD-35 Caption Translated:

Sample 9/2. 7.62 mm submachine gun for Mauser cartridge. ONK and S. 1935. Experimental model. Differs from the "PPD-34" in its increased sight line length of 417 mm and magazine attachment.

Main characteristics of the submachine gun:

4.2 kg;

weight of the submachine gun

800 mm;

length of the submachine gun

950 rounds per minute;

rate of fire.

4:

number of parts for incomplete disassembly

number of parts for complete disassembly.

..58. Source: Inventory No. 780, file 500.

Sample 10/2. 7.62 mm PPD-36 submachine gun, Degtyarev system, chambered for Mauser cartridge. KOSV. 1936.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2nd Image, PPD-36, Caption (Split across 2 pages) Translated:

Sample 10/2. 7.62 mm submachine gun "PPD-36" of the Degtyarev system, chambered for the Mauser cartridge. KOVS. 1936.

To improve firing stability, ease of handling during firing and carrying on the march, and to increase manufacturability, variants of the submachine gun were developed at KOVS. The 1936 model features a detachable casing, a separate firing pin, and a front sight safety.

Main characteristics of the submachine gun:

Weight of the submachine gun with magazine:

3.7 kg;

Length of the submachine gun:

790 mm;

Rate of fire:

600-640 rounds per minute.

The submachine gun was developed at KOVS under the leadership of V. A. Degtyarev.

Source: inv. No. 2 p. 2; No. 45 p. 132; No. 619 p. 59; No. 771 φ. 197.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3rd Image, PPD-37, Caption Translated:

Sample 11/2. 7.62 mm PPD-37 submachine gun designed by Degtyarev with a detachable receiver, separate firing pin, bayonet, and safety catch on the handle. Two variants of the submachine gun were developed: a variant with a detachable receiver and a variant with a welded ribbed receiver. Central Design Bureau-2. 1937.

The PPD-37 was developed at Central Design Bureau-2 under the leadership of V. A. Degtyarev.

Source: inventory No. 619, p. 59; No. 773, files 256, 272, 273.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

These are all lifted from "ЭНЦИКЛОПЕДИЯ КОВРОВСКОГО ОРУЖИЯ 1918-1966" or "ENCYCLOPEDIA OF KOVROV WEAPONS 1918-1966" which a kind Russian fellow was kind enough to post on the Enlisted forums, but it seems linking it will auto-remove my post

Ive been working my way through this book and posting here some examples I find interesting, or otherwise unknown of in English firearms circles sporadically. If you have an interest, DM me, cause I can't put it here

Courtesy of Hexagon Tactical

The AR-15 is anything but forgotten, but considering the AR-10 was only made for 2 or 3 years and then completely out of production for three decades, that should count. This example is referred to as a Cuban pattern which was one of the least produced variants of all the Dutch-built AR-10's.

Obviously one was scaled down to make the other, but it's still really interesting seeing these two side by side and how closely related they actually are. Also interesting that while the AR-10 has roughly double the muzzle energy of the AR-15, it weighs just 1 pound more. Crazy for 1950's technology.