How The Mk 19 Sear Works

The receiver sear cannot be lowered if the recoil pins are in the way. Ensure the recoil pins are pushed toward the outside of the sear housing before attempting to lower the receiver sear.

a. Raise the receiver sear (29). Insert either recoil pin (31), round end first, into either side of the sear housing (19) until the narrow (flat) end is flush with the outside of the sear housing. Ensure the narrow (flat) end is horizontal to the sear housing.

b. Slide the receiver buffer body (9) onto the sear housing until the access holes are aligned. Then push the recoil pin (31) through the hole until the round end of the recoil pin is flush with the inner surface of the sear housing (19).

c. Repeat for the other receiver buffer body and recoil pin.

How The Sear Works

10. INSTALL THE SEAR HOUSING CAP (SOLENOID).

a. Make sure the safety is on 'F' (FIRE) position.

b. Line up the cutout on the sear housing cap (32) with the cutout in the sear housing (19).

32 19

32 19

Mk19 Solenoid

c. MK 19 MOD 3: Push in on the sear housing cap and rotate it 90 degrees so the notch in the sear housing cap mates with the lock pinhole. (Upgunned Weapons Station: Push in on the solenoid and rotate it 90 degrees so the notch in the solenoid (33) mates with the lock pinhole.

11. INSTALL SEAR SPRING PIN AND HELICAL COMPRESSION SPRING.

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