Is it suppressed? Those look like wipes on the muzzle
Looks like this is it.
The
NRS-2 (
Нож Разведчика Стреляющий, "Scout Firing Knife") (official
GRAU index
6P25U) is a
gun hybrid with a combination of a knife blade and a built-in single-shot shooting mechanism designed to fire a 7.62×41mm SP-4 (СП-4) cartridge, originally designed for the
PSS silent pistol.
[1]
It was manufactured by the Tula Arms Plant for Soviet
Spetsnaz troops in the 1980s, and is still used as a personal weapon for modern
Spetsnaz troops and special law enforcement groups. The NRS-2 is designed for either stabbing or throwing with the blade, or fired at distances of up to 25 metres.
Shooting mechanism[edit]
To load the shooting mechanism, the opening lever is pressed, and the barrel rotated out of the knife handle, then the cartridge is reinserted into the firing chamber and the barrel is inserted back into the handle and rotated back into place using two prongs that fit into the outer latch. The flip-up lever on the right side of the NRS-2 is pulled to cock the internal hammer, and before firing the safety catch located beside the barrel must be turned to the "fire" position. Then the user's left hand is used to hold the underside of the grip, and the right hand held against the right side, with the right index finger being placed on the single action push-button trigger, which is located above the safety catch beside the gun barrel.
[2]
en.wikipedia.org
And the ammunition. Pretty expensive to shoot since every round requires a $200 tax stamp.
The SP-4 cartridge is a very specialized round, developed during early 1980s for the needs of the KGB and Spetsnaz elements of the Soviet armed forces. The key niche of this ammunition is noiseless and flash-less firing during various special operations. The only weapons that use this cartridge...
modernfirearms.net
"What this means is that although the pistol is highly specialized to fire this specific round, it is the ammunition itself that is “silent.” In the United States,
each individual round is considered to be a silencer subject to the registration/transfer requirements of the National Firearms Act in its various incarnations."