M242 25mm Barrel Extension

Do not apply grease to threads of rocker support rod.

Using acid brush, apply a light coat of grease on externally relieved screw (1), headed straight pin (2), sear release link (3), interlock crank (4), push rod extension (5), sear push rod (6), push rod extension spring (7), rocker support rod (8), rocker (9), rocker spring housing (10), recoil rocker spring (11), and operating rod assembly (12).

ASSEMBLY

1. INSTALL OPERATING ROD ASSEMBLY.

Place operating rod assembly (1) in auto gun receiver (2) with step-up portion (3) on top.

Fork Spring Rods Short

ASSEMBLY - Continued

2. INSTALL FRONT CHAIN GUIDE.

a. Position short forks (4) of front chain guide (5) to right of operating rod assembly (1) as shown. Lower front chain guide (5) straight down against front wall (6) of auto gun receiver (2) until guide is all the way down.

b. Apply sealing compound primer and one drop of adhesive to threads of two capscrews (7).

c. Install and torque two capscrews (7) to 80 in.-lb ± 5 in.-lb (9.04 N-m ± 0.57 N-m).

M242 Rocker Assembly

3. INSTALL ROCKER ASSEMBLY.

a. Place recoil rocker spring (8) in rocker spring housing (9).

b. Install rocker (10) on rocker spring housing (9) and align pin holes.

d. Place rocker assembly (12) on operating rod assembly (1).

Rocker Receiver

e. Place rocker support rod (13) through side of auto gun receiver (2) and through rocker assembly (12).

f. Torque rocker support rod (13) to 325 in.-lb ± 25 in.-lb (36.73 N-m ± 2.83 N-m).

Pivot Rocker Lever Firearm

ASSEMBLY - Continued

4. INSTALL SEAR RELEASE LINK.

a. Position auto gun receiver (2) with mechanical housing (14) at top.

b. Lower sear release link (15) through auto gun receiver (2).

M242 Rocker Assembly

c. Align pivot pin hole in sear release link (15) middle hole, with sear linkage pin hole in auto gun receiver (2).

d. Install externally relieved screw (16).

Auto Sear Blueprint

e. Push headed straight pin (17) through sear release link (15) and solenoid plunger clevis (18).

f. Install new cotter pin (19) in headed straight pin (17). Bend ends of cotter pin (19) in opposite directions around sides of headed straight pin (17).

5. INSTALL REAR CHAIN GUIDE.

a. Place interlock crank (20) on rear chain guide (21).

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b. Place sear push rod (22) on rear chain guide (21) with pegs facing out.

M242 Gear Assembly
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ASSEMBLY - Continued c. Install push rod extension spring (23) in push rod extension (24).

25mm Bushmaster Chain Gun

d. Place push rod extension (24) on pegs of sear push rod (22) and interlock crank (20). Compress push rod extension spring (23) to bear against rear chain guide (21).

Receiver Chain Gun

e. Place auto gun receiver (2) with spur assembly gear (25) up.

f. Position long forks (26) of rear chain guide (21) closest to spur assembly gear (25). Lower rear chain guide (21) straight down into auto gun receiver (2), keeping it 1/4 in. (6.4 mm) away from rear wall (27) of auto gun receiver (2) to clear sear release link (15). Align sear push rod (22) peg with sear release link (15) by slightly actuating sear release link (15).

M242 Feeder

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