2.6. Disassembly and assembly of rifle
2.6.1. The disassembly of the sniper rifle may he partial and
complete: partial disassembly is performed for cleaning, oiling and
inspection of the rifle. Complete disassembly is required for cleaning
the rifle if it is heavily soiled and after it has been exposed to
the rain or snow, or when the rifle is to be newly lubricated and
repaired.
The frequent disassembly of the sniper rifle is harmful to the
weapon, as it tends to increase the wear of its parts and mechanisms.
When disassembling and assembling the sniper rifle do not
apply an extra effort and sharp blows.
When assembling the sniper rifle, check the numbers on its
parts; the number stamped on the receiver should correspond to
the numbers available on all its parts.
2.6.2. For partial disassembly of the sniper
rifle, adhere to the following procedure:
a. Detach the magazine. Take the magazine with the hand,
press the latch, move the bottom part of the magazine forward and
detach it.
Then make sure that there is no cartridge in the cartridge chamber,
for which purpose lower the safety lock, retract the reloading
handle of the bolt support, inspect the cartridge chamber and release
the reloading handle.
b. Detach the optical sight. Raise the handle of the clamping
screw and turn it towards the eye shield as far as it will go; shift
the sight backward and detach it from the receiver.
c. Detach the cheek plate. Turn the fastener of the cheek plate
lock downward, remove the loop from the hook of the clip and
detach the cheek plate.
d. Detach the receiver cover together with the retracting mechanism.
Turn the axle pin of the receiver cover backward so as to
engage it with the axle pin retainer; raise the rear part of the
receiver cover and detach the receiver cover together with the retracting
mechanism.
e. Detach the bolt support and the bolt. Pull back the bolt support
as far as it will go, raise it and detach it from the receiver.
f. Detach the bolt from the bolt support. Pull the bolt backward,
turn it so that its guiding lug comes out of the shaped recess of
the bolt support and move the bolt forward.
g. Detach the firing and trigger mechanism. Turn the safety
lever upward till it occupies the vertical position, shift it to the
right and detach from the receiver; holding the trigger guard move
the firing and trigger mechanism downward to detach it from the
receiver.
h. Detach the hand guards. Press the axle pin of the upper band
to the gas tube so that the lug of the axle pin tongue comes out of
the band recess and turn the latch clockwise as far as it will go:
shift the upper band to the muzzle part; pressing the hand guard
downward and shifting it sideways, detach it from the barrel.
i. Detach the gas piston and the pusher together with the spring.
Pull the pusher backward, disengage its front end from the gas
piston port and detach the piston from the gas tube; insert the
front end of the pusher into the gas tube and compress the pusher
spring till it protrudes beyond the passage of the sight bar; detach
the pusher and the spring, then detach the spring from the pusher.
2.6.3. To assemble the sniper rifle after partial
disassembly, adhere to the following procedure;
a. Connect the gas piston and the pusher with the spring. Fit
the spring onto the rear end of the pusher; insert the front end of
the pusher into the gas tube, compress the spring and insert the
rear end of the pusher together with the spring into the passage of
the sight bar; pull the pusher backward and remove its front end
from the gas tube sideways; insert the gas piston into the gas tube,
and the front end of the pusher into the piston socket.
b. Connect the hand guards. Insert the rear end of the right
(left) hand guard into the lower band, press the hand guard downward
and fasten it on lugs of the supporting ring; fit the upper
band onto the end pieces of the hand guards and turn the axle pin
of the upper band to the gas tube so as to let its lug enter the
recess on the band.
c. Connect the firing and trigger mechanism. Engage the recesses
of the firing and trigger mechanism body with the stop pin
and press the firing and trigger mechanism to the receiver; insert
the safety lever pin into the hole of the receiver, then turn the
safety lever in the clockwise direction so as to let the lug of the
safety lever enter the lower recess of the receiver.
d. Connect the bolt to the bolt support, insert the bolt into the
passage of the bolt support, turn the bolt so that its driving lug
enters the shaped recess of the bolt support and move the bolt forward
as far as it will go.
e. Connect the bolt support and the bolt. Insert the guiding lugs
of the bolt support into recesses of the receiver and move the bolt
support forward.
f. Connect the receiver cover together with the retracting mechanism.
Insert the return spring into the passage of the bolt support,
insert the lugs on the front end of the cover into recesses on the
lower band; press the rear end of the cover to make the cover fit
tightly to the receiver, turn the axle pin of the receiver cover
forward to set it on the cheek plate limiter.
g. Connect the butt cheek plate. Put the cheek plate on the butt
with its fastener to the right, fit the loop onto the hook of the clip
and turn fastener upward,
h. Connect the optical sight. Match the slots on the sight
bracket with the lugs on the left wall of the receiver; shift the sight
forward as far as it will go and turn the handle of the clamping
screw towards the objective so as to let the handle lug enter the
recess of the bracket.
i. Connect the magazine. Insert the front hook of magazine into
the opening of the receiver and turn the magazine to yourself to
let the latch engage the rear hook of the magazine.
2.6.4. To completely disassemble the sniper rifle,
proceed as follows:
a. Perform the partial disassembly as instructed in item 2.6.2.
b. Disassemble the magazine. Depress the lug of the locking
strip into the hole of the magazine cover and shift the cover somewhat
forward; holding the locking strip remove the cover from the
body; releasing the spring gradually, remove it together with the
locking strip from the magazine body, then detach the follower.
c. Disassemble the retracting mechanism. Remove the front
return spring from the guiding bushing; compress the rear return
spring and holding the guiding rod move it downward and to
yourself to withdraw the guiding rod from the shackle hole; detach
the rear return spring and the guiding rod from the guiding bushing.
d. Disassemble the bolt. Use the drift to drive out the stud securing
the firing pin; remove the firing pin from the bolt passage,
then remove the extractor and the spring from the bolt in the same
way.
e. Disassemble the firing and trigger mechanism (Fig. 14).
Press the autosafety lever and disengage the autosafety sear from
the hammer; holding the hammer, press the trigger and gradually
release the hammer from the cocking cam; disengage the ends of
the trigger spring from the hooks of the firing and trigger mechanism
body. Use a screwdriver to match the lugs trigger mechanism
pins with recesses located on the right-hand wall of the
firing and trigger mechanism body. Drive out the trigger mechanism
pins and detach these parts. Use a drift to drive out the hammer
pin, detach the hammer together with the mainspring, then
remove the mainspring.
f. Detach the gas tube together with the gas regulator. Turn
the gas regulator so as to match the recess on its front part with
the gas tube latch, press the latch and use the container-wrench to
unscrew the gas tube, then remove the gas regulator from it.
2.6.5. Reassembling the sniper rifle after complete disassembly.
For this purpose proceed as follows:
a. Connect the gas tube and the gas regulator. Fit the gas regulator
onto the gas tube, press the latch of the gas tube and screw
in the gas tube with the aid of the container-wrench to match the
recess on the gas tube front part with the latch, depress the latch
lug into the recess of the gas tube, set the gas regulator at the
required division.
b. Assemble the firing and trigger mechanism. For which
purpose insert the trigger together with its spring into the body,
insert the pin, match its lug with the recess on the right-hand wall
of the body and turn the pin by means of the screwdriver. Fit the
mainspring onto the hammer jounals and insert the hammer into
the body.
Insert the sear into the body so that its tail enters the loop of
the mainspring long end; insert the pin, match its lug with the
recess on the right-hand wall of the body and turn the pin by
means of a screw-driver.
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Fig. 14.Firing and trigger mechanism:
1 - firing and trigger mechanism body;
2 - trigger mechanism pin; 3 - trigger with rod; 4 - trigger spring;
5 - sear; 6 - autosafety; 7 - hammer; 8 - mainspring; 9 - hammer pin;
10 - magazine latch pin; 11 - magazine latch; 12 - magazine latch spring.
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Insert the aulosafety into body so that its tail enters the loop of
the mainspring short end; insert the pin matching its lug with the
recess on the right-hand wall of the body and turn the pin by the
screwdriver; insert the hammer pin and engage the ends of the
trigger spring with the hooks of the body.
c. Assemble the bolt. Insert the extractor together with its
spring into the seat of the boll. Pressing the extractor, insert the
extractor pin; insert the firing pin into the passage of the bolt and
insert the firing pin stud into the hole of the bolt from the side of
the guiding lug and push the stud as far as it will go.
d. Assemble the retracting mechanism. Insert the guiding rod
(with its flats facing forward) into the guiding bushing from the
side of the large diameter hole, fit the return spring onto the guiding
bushing from the side of the rod and compress the spring so
that the end of the guiding rod with its flats comes out from under
the spring; holding the guiding rod in such a position insert it
together with the spring and the bushing into the lower hole of the
shackle, then move the rod forward along the facets of flats into
the upper hole; release the spring (its end should enter the shackle
cup); fit the second return spring onto the guiding bushing.
e. Assemble the magazine. Insert the follower and the spring
into the magazine body; compress the spring to fit the locking
strip into the body and, holding it in that position, put the magazine
cover on the body so that the lug of the locking strip enters
the hole of the cover.
f. Further on proceed with assembly as instructed in item 2.6.3.
2.7. Cleaning and lubrication
CONTENTS
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