Manual

18
Release safety lock and press the trigger; a click should be heard,
which is indicative of the energetic blow delivered by the hammer
against the firing pin.
Set the rifle at safe again and attach the magazine; the bolt
support should not move backward, the safety lock should be reliably
retained in the required position.
Check the feed of cartridges into the cartridge chamber, extraction
and ejection of fired cases (cartridges). Fill the magazine with dummy
cartridges, attach it to the rifle, and without pressing the magazine
latch, try to detach the magazine with the effort of the hand, the
magazine should freely enter the opening of the receiver and should be
securely retained by the magazine latch.
Reload the rifle several times, the dummy cartridges should be fed,
without any delay, from the magazine into the cartridge chamber and
rushly extracted from the receiver outward.
When checking the condition of the optical sight, make sure that the
objective and eyepiece lenses are not broken. Check to see that the
knobs rotate smoothly and are reliably fixed in the required position,
they are free of play; the sight is free of play and the clamping screw
reliably secures the sight on the rifle; the reticle illuminating set
is in sound condition; to this end, fit the cap onto the objective,
switch on the tumbler switch and look into the eyepiece (if the
illuminating set is in good repair, the reticle is seen distinctly; if
the reticle is not seen, replace the cell or the electric lamp).
If the sight is not free of play or the handle-guiding lug does not
enter the recess in the bracket, with the sight reliably secured on the
rifle, adjust the clamping screw.
To this end, detach the sight from the rifle, press the slide to the
handle (compress the spring) and screw the clamping screw adjusting nut
in or out.
Inspect cartridges before firing. When inspecting the cartridges,
make sure that the cartridge cases are not bent and free of rust, the
bullet does not play in the cartridge case mouth; the primer is free of
verdigris and cracks, no setback of the primer occurs; are there some
dummy cartridges among live cartridges or not. All the defective
cartridges are to be transferred to the depot.
2.5.2. All defects of the rifle, the optical sight, magazines and
accessories should be immediately eliminated. If there is no
opportunity to eliminate the troubles in the subunit, transfer the
rifle (the optical sight, magazines, accessories) to the repair shop.
2.5.3. Careful handling the rifle and proper care of it provide
reliable, trouble-free operation and long service life of sniper rifle
parts and mechanisms. However, in case of clogging and wear of rifle
parts and mechanisms and in case of careless handling the rifle or in
case of cartridges damage, stoppages in fire may occur.
If during firing stoppages occur, reload the rifle, for which
purpose energetically retract the bolt support by the handle, release
it and proceed with firing.
If the stoppage is not eliminated, determine the cause of the
trouble and eliminate the stoppage as instructed in the Table No. 2.