Remington R300 User Manual Page 21

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21
106088
5
6
8
Buffer and Piston Replacement
TO REPLACE BUFFER
AND PISTON:
1. Remove tang cap (1), compression
spring (2), and tang (3). If tang does not
drop out, thread 1/4-20 screw into tang
and pull out. Slide barrel assembly
from receiver (4).
IF TOOL DOES NOT OPEN AFTER
OVERDRIVE the buffer is binding on
the piston in the muzzle cap. Remove
barrel assembly as in step 1, then:
a. Loosen muzzle cap (5) about 1/4 inch.
Be sure at least one full thread is still
engaged.
b. Drive piston (7) back until it is about 1/4
inch below the end of the muzzle cap.
c. Remove the damaged buffer (8) from
the piston. Inspect the piston and
muzzle cap for damage.
TO REASSEMBLE:
1. Push new piston (7) all the way into the
barrel (6).
2. Place new buffer (8), small end first, in
new muzzle cap (5) and screw muzzle
cap into barrel
Barrel Assembly
4
3
2
1
2. Remove muzzle cap (5) from barrel (6)
by unscrewing counterclockwise.
482-93
5
6
7
6
482-88
3. Insert a rod or screwdriver into barrel
chamber (6) and push piston (7) and
buffer (8) out. Should the buffer be-
come stuck in the muzzle cap, use a
sharp object such as an awl on the rim
of the buffer to remove it.
482-94
8
7
6
3. Slide the assembled barrel (6) into
receiver (4). Turn barrel to line up slot
for tang. Insert tang (3) and tang spring
(2). Replace tang cap (1).
Insert small
end of
buffer into
muzzle cap
first.
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