Take hold of gas lever pin and throw the gas lever rearward until it strikes the bottom plate, and hold in this position. Withdraw handle lock and insert small end of same in small hole in rear end of gun, and on right side, pushing handle lock in as far as it will go. This causes the bolt pin to lock slide to receiver and to hold gas lever back. Bolt pin will then project from left-hand side. Leave in this position. Replace handle lock.
Attached to gas cylinder will be found barrel lock; place small end of combination wrench under point of barrel lock and press down and out until it clears barrel. Engage combination wrench in slot in under side of barrel just forward of gas cylinder and unscrew; then pull barrel forward and out.
To Replace Barrel.
Push barrel in as far as it will go and engage threads; complete this operation with wrench until lines on top of barrel and receiver coincide. Swing barrel lock up into slot. Release gas lever by pushing in bolt pin from left-hand side as far as it will go with handle lock. Replace handle lock. Do not remove or replace barrel until gas lever has been thrown to rear and locked in that position.
To Strip.
Lay gun on right side, muzzle to left. Turn side plate lock screw to left to bring cut in same clear of groove in side plate screws. Unscrew side plate screws and remove. Place right hand on rear of left-hand side plate, press downward, and with the left hand raise front of plate. Turn gun over and remove right-hand plate in same manner. Turn gun so as to bring bottom plate upward. Raise gas lever slightly with left hand, and lift bottom plate out. Raise gas lever again and pull out slide pin. Push slide to rear until it remains. Remove retracting spring tubes by pulling nearest tube toward you and pushing other away from you. Pull or push out gas lever bracket pin, then lift gas lever and connections out of bracket. Push carrier pin out with pointed end of screwdriver and lift carrier out of receiver. Unscrew locking screw and belt guide screw in belt guide. Lift belt guide out. If belt guide should stick, push the point of screwdriver under the slide at rear of belt guide and gently pry upward. Remove handle lock and pull handle out to rear. Push slide to rear and insert end of handle lock in small hole in rear of receiver in side nearest to you, and push out bolt pin. Pull slide to front and out and then push bolt out to rear with finger. Remove safety and trip.
To Assemble.
Hold gun with slot in receiver upward. Insert bolt, front end first. Replace slide, pushing to rear as far as it will go. Replace bolt pin, pushing it in as far as it will go by using end of handle lock. Replace belt guide and screw, having locking screw engage groove in belt guide screw. Replace carrier, having flat side or bottom up and carrier dog down. Insert pin. Replace gas lever, having piston drop into hole in gas cylinder. Adjust gas lever until large pin holes in gas lever and gas lever bracket are opposite each other, then insert gas-lever bracket pin. Next place retracting spring tubes in position having slot in followers align with long slot in retracting spring tubes. Force follower over projecting end of retracting connection by pressing follower end inward, at the same time slightly compressing retracting springs until pilot at end of tube clears bracket. Press tube inward at bracket end and into hole for pilot. Place bottom plate in position by putting tongue at rear end in receiver first and flush with rear end of receiver. Place safety in position. Right-hand side plate should be next placed in position, taking precaution to have slide pushed to rear as far as it will go and the feed lever on plate carried to rear as far as it will go, so that feed lever will lay between projections on slide when plate is in position. To place plate in position, have the dowel at rear of plate enter hole for same, in receiver, at the same time having groove near edge of plate engage rib on bottom plate and gas lever bracket pin enter hole in front end of plate. Turn gun over to rest on plate, draw slide forward, having slot at forward end of slide engage end of gas-lever connection. Hold gun at rear end with right hand to prevent moving. Take hold of gas-lever pin with the left hand and swing gas lever outward until slide pin can be pushed into hole in slide through gas-lever connection, having flattened end of slide pin enter slot in side plate. Place trip in holes and slot in receiver. Place left-hand slide plate in position by the same method as right-hand plate. Place side plate screws into holes in front and rear of side plates. If screws do not enter freely see that bottom plate is flush with rear of receiver; if not, tap bottom plate gently on front end until it is flush with rear end of receiver. Screw plates together and lock with locking screws, making a quarter turn of these screws to engage grooves in side plate screws. Push handle into hole in rear of receiver and lock with handle lock. Handle lock is placed in position by inserting large end into hole with the stem held upward and then turned toward front and downward to have projection engage locking cut in side plate and until handle lock stop springs over stem. Place gun in mount and run a few cartridges in a belt through gun to see that mechanism works properly. Keep hand away from trigger during this latter operation, and be sure to work gas lever until all cartridges are out of gun.
LIST OF PARTS.
1. Handle. 2. Handle lock. 3. Handle lock and safety stop. 4. Handle lock and safety stop spring. 5. Handle lock and safety stop screw. 6. Hammer. 7. Mainspring. 8. Trigger. 9. Trigger spring. 10. Sear. 11. Sear spring. 12. Trigger and sear pin. 13. Bolt. 14. Bolt pin. 15. Shell extractor. 16. Shell extractor spring. 17. Shell extractor pin. 18. Firing pin. 19. Firing-pin spring. 20. Firing-pin stop pin. 21. Carrier. 22. Carrier pin. 23. Carrier dog. 24. Carrier-dog pin. 25. Carrier-dog spring. 26. Carrier-dog plunger. 27. Gas cylinder. 28. Gas-cylinder pin. 29. Gas lever. 30. Gas-lever pin. 31. Gas-lever connection. 32. Gas-lever connection pin. 33. Gas-lever bracket. 34. Gas-lever bracket pin. 35. Gas-lever piston. 36. Gas-lever piston-pin. 36A. Gas-lever piston-pin cotter pin. 37–38. Retracting springs. 39. Retracting-spring tube, R.H. 40. Retracting-spring tube, L.H. 41–42. Retracting-spring follower. 43–44. Retracting-spring tube screws. 45. Retracting connection. 46. Retracting-connection pin. 47. Retracting-connection long link. 48. Retracting-connection long link rivet. 49. Retracting-connection short link. 51. Retracting-connection short link rivet. 52. Stock, R.H., with escutcheon. 53. Stock, L.H., with escutcheon. 54. Stock screw. 55. Front side plate screw. 56. Front side plate screw, Lock screw. 57. Rear side plate screw. 58. Safety. 59. Belt guide. 60. Belt guide screw. 61. Feed-wheel and bushing. 62. Feed-wheel shaft. 63. Feed-wheel dog. 64. Feed-wheel dog screw. 65. Feed-wheel dog spring. 66. Feed lever. 67. Feed lever screw. 68. Feed throw-off. 69. Feed throw-off spring. 70. Feed throw-off screw.