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.