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Kalashnikov Reflex Suppressor KRS
The KRS (MPV) Kalashnikov Reflex Suppressor handles full auto firing with standard full power ammo simply by having a sufficiently large volume first expansion chamber and welded steel construction. Gas port pressure increase is very moderate, but still enough for reliable feeding cycle with subsonic ammo. KRS operates by offsetting muzzle blast with a diffractor cone, and then reflecting the blast as a single wave front backwards in expansion chamber. Blast waves escaping through bullet holes are progressively muffled in low pressure expansion chambers between 12 cup-formed baffles. KRS is used with model marking "MPV" (Maanpuolustusvaimennin = Defense Suppressor) with MPS rifles made for Finnish reservists by Norinco, China. KRS unit weight is 420 grams (14.8 oz.) and length 177 mm (6.96"), and it mounts in seconds to the Kalashnikov standard left-hand M14x1 muzzle thread. Suppressor aligning must be checked when mounting it for first time, because AK muzzle thread aligning may vary individually.
03.04.2009
User's Manual: Kalashnikov Reflex Suppressor KRS
KRS (MPV) is an all-steel Reflex Suppressor for Kalashnikov AK-47, AKM and AK-74 rifles, operating on shock wave reflection and gas expansion principle. Suppressor is primarily intended for reduction of environmental grievances and eliminating risks to hearing. KRS is built for harsh military use and full-auto firing. KRS does not affect bullet speed or precision and mounts on the already existing left handed M l4x1 muzzle thread of AK or AKM. Although the optional silencing effect is achieved with subsonic cartridges (bullet velocity abt. 300 m/s), Reflex Suppressor KRS accepts full power 7.62 x 39 ammunition (bullet velocity 700 m/s or more) and the shooting noise is comparable to an unsuppressed .22 LR rifle. Along with the noise reduction, the suppressor acts as a muzzle brake thus bringing down recoil and muzzle jump. Additional weight in front of of the muzzle results in steady aim and enhanced accuracy. Flash hiding effect is outstanding. Reflex Suppressors standard finish is military grade Parkerizing.
Fastening and unfastening: The muzzle compensator of AK or AKM is removed by pushing its locking pin down and rotating the nut clockwise. Suppressor is rotated counterclockwise on the left-hand M14x1 muzzle thread, tightening firmly by just one hand. Note: Never use tools; over-tightening is unnecessary and may lead to eccentric mounting. When unwinding , use a heat-insulating glove or cloth, if rapid firing has heated up the jacket of the suppressor.
Mounting and aligning:
After mounting the suppressor to the rifle for the first time, its aligning with the
barrel must be checked by looking through the bore. If the bore and the holes of the
silencing baffles are not in line, the eccentricity is corrected by filing carefully the
rear end of the mounting sleeve slanting, until aligning is achieved. See separate aligning instructions. If in doubt, how the job should be done,
leave it to a qualified gunsmith. Centering should be rechecked for each AK or AKM
individually, as the muzzle threads of Kalashnikovs are not absolutely precise. Check
frequently the tightness of the mounting thread. Unaligned or loose suppressor will affect
accuracy or in worst case the suppressor may be damaged by bullets scratching the baffles.
After aligning, the KRS may be secured against accidental loosening by filing or machining
in the rear end of it a slot just like the original AK compensator has for its locking pin
in the front sight base.
Please, note: Do not shoot unstable bullets or shotshells through the suppressor! Also remove the suppressor before shooting discarding sabot bullets or flechettes. With full power supersonic ammo the "ballistic crack" or "whiplash noise" of bypassing bullet is an unavoidable evil, as the velocity of the bullet is higher than the velocity of sound in air (330-340 m/s). When subsonic, bullet velocity must be less than Mach 0.88 (about 300 m/s), as flight noise gets generated along with transonic velocity. For detailed information, see bullet flight noise vs. bullet speed. However, the crack of a supersonic bullet may be used to camouflage the position of a shooter acoustically.
Maintenance: KRS is practically
maintenance-free. Normal fouling , due to powder and primer residue, has no effect and
they are easy to remove by shaking the suppressor vertically, rear end downwards. After
shooting it is advisable to remove the suppressor to avoid the condensation of corrosive
powder gases, allowing them to evaporate. In very corrosive conditions, a thin layer of
high-temperature resistant grease (lithium , copper or graphite) can be applied on the
thread before fastening again to avoid need of excessive power in assembly or disassembly.
Apply regular gun oil for storage inside and outside the suppressor.
Kalashnikov Reflex Suppressor KRS
Kalashnikov Reflex Suppressor in Internet: http://guns.connect.fi/rs/krsgraaf.html
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