1. Put the gas-check ring and face-plate in place.
2. Put in the spring.
3. Put in the spindle.
4. Screw on the nut, and put in the spline-screw.
5. Put the carrier-ring on the breech-block.
6. Put in the stop and screw.
7. Put in the latch, the latch-spring; put on the latch-cover and screws.
8. Insert the breech-block with carrier-ring into the gun.
9. Put in the hinge-pin and screws.