Remington r300 - Manual (Page 18)

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3. To assemble, push piston
(E) all the way into barrel
(B) using a screwdriver (G).
Slide the barrel assembly
(B) into the receiver (D).
Turn barrel (B) to line up
tang slot (F) with tang (C).
Insert tang (C) into tang slot
(F). Firmly tighten knurled
tang nut (A).
1. Unscrew knurled tang nut
(A). Slide barrel assembly
(B) out and remove tang (C),
then remove barrel assem-
bly (B) from receiver (D).
WarnInG: nEVEr disassemble, replace barrel, clean,
or assemble a powder actuated tool while it is loaded.
Barrel replacement
B
E
S F
D B
B
G
S F
B
D
S F
A
F
B
C
A
S F B
C
2. If tool has been overdriven, tap piston (E) on a hard surface
until the piston is pushed back into the muzzle. Inspect the
barrel assembly (B) and replace if damaged.