View Full Version : Very Quiet Russian Pistol (Video)

February 17, 2008, 04:39 AM
What the heck is this thing?

It seems to fire some sort of very large, very slow projectile. It is very quiet. It does not seem to have a conventional suppressor of any sort. Impressive.

Who here speaks Russian?

Anyone have a clue how this thing works?

February 17, 2008, 06:10 AM
OK, I was totally wrong. It uses a gas-piston "silent cartridge" and only drives a 143gr 7.62mm projectile at 885fps. The video threw me off, the loaded rounds look like .308 cases trimmed off at the shoulder and loaded with huge wadcutters. That world.guns.ru is a great site...

SP-4 silenced ammunition
The key problem with the SP-3 and PZAM ammo were their telescoped pistons, which projected significantly from fired cases and thus made almost impossible to develop the semi-automatic weapons for these cartridges. During late 1970s and early 1980s soviet designers solved this problem by developing the 7.62x42 SP-4 ammunition, which used the same basic principle. The telescoped two-stage piston has been replaced by single-stage piston, which did not projected from the case when fired; the standard 7.62mm M43 bullet has been replaced by the cylindrical bullet, made of mild steel, and fitted with a brass driving band at the front. This cartridge has been adopted circa 1983 by KGB and Spetsnaz elements of the Soviet Army, along with six-shot, magazine fed, blowback operated semiautomatic PSS pistol and single-shot NRS-2 scout shooting knife. The SP-4 ammunition and PSS pistols are still in use by elite Spetsnaz units within Russian armed forces, as well as by some FSB and MVD elite units. Apparently, the earlier MSP pistol with SP-3 ammo and SP-4M pistol with PZAM ammo were not phased out of service and still can be encountered in the hands of serious operators, who not require multi-shot capabilities of PSS / SP-4 system.
cartridge metric designation bullet weight muzzle velocity
SP-4 7.62x41 9,3 g / 143 grain 270 m/s / 885 fps

February 17, 2008, 08:45 AM
The case is based on the 7.62x39mm, with a sliding piston dropped into the case on top of the powder before the case is necked down to .30-calibre. After the heavy AP bullet is crimped into the neck, the round is ready to go. Since the expanding propellant gases can't exit the case or the barrel, they don't make the "BANG!" that a normal gun shot does. Not surprisingly, these cases are also supposed to be VERY hot after they're fired. The US fielded a similar system in Vietnam, as the Quiet Special Purpose Revolver (QSPR), only based on a modified N-frame S&W that used this type of "captured piston" ammo.

chris in va
February 18, 2008, 09:34 PM
I passed it along to my Russian friend. He loves stuff like this.

max popenker
March 3, 2008, 10:21 AM
Here's the gun (http://world.guns.ru/handguns/hg24-e.htm) and the ammo (http://world.guns.ru/ammo/sp-e.htm#SP-4) ;)


March 3, 2008, 12:02 PM
The Russians also make an interesting single-shot "knife-pistol" (the NRS-2) that uses the same silenced ammunition: