ASSEMBLING.
1st.—Mount in order the following parts: fermeture nut, barrel nut, hand guard, barrel, ejector, spring and cap, feed piece, feed piece spring.
2nd.—Assemble the trigger, sear and sear spring, and then mount them in guard.
3rd.—Mount the recoiling parts in receiver.
(a) Assemble extractor with breech block. (b) Mount the firing pin, bringing it to its rearmost position and turning head to left behind shoulder in breech block. (c) Engage piston tang in the under slot of breech block. (Rear face of tang should abut against the rear wall of slot, and under tang of firing pin should engage in corresponding groove in piston tang.) (d) Turn fermeture nut to the open position by passing first finger of left hand in ejection slot of receiver. (When in the open position the ejection slot in the fermeture nut coincides with the ejection slot in the receiver.) (e) With the right hand grasp rear of piston assembled with breech block, placing thumb on head of firing pin so as to hold it turned to left behind shoulder of breech block. (f) Insert piston assembled with breech block in rear of receiver and push it forward with right hand until it comes to a stop. (Its rear face will now be about 1½ inch in front of rear of receiver.) N.B.—It is imperative that the head of firing pin be turned completely to the left, and that fermeture nut be at the open position. The mechanism should slip into place easily, forcing being neither necessary nor permissible. (g) While pressing on the lower end of feed piece with the right hand so as to bring it to its highest position, push forward piston with left hand until breech is closed.
4th.—Insert recoil spring in piston and push forward, allowing a few inches to project to rear of receiver.
5th.—Mount guard.
(a) Grasp pistol grip with right hand as for firing, making sure that firing gear is properly mounted by pulling trigger several times. (b) Engage projecting end of recoil spring in its seat in the guard.
6th.—Mount cocking handle.
(a) Insert shank of cocking handle in opening in guard, the knob inclined at 45 degrees to right, and push forward to a stop. (b) Throw knob to left to a stop. (c) Push cocking handle forward until home, and then throw knob to right and down as far as it will go.
In order to replace a defective extractor or firing pin proceed as follows:—
1st.— Close breech. 2nd.— Remove cocking handle. 3rd.— Remove guard. 4th.— Withdraw recoil spring. 5th.— Remove recoiling mechanism.
Replace defective part by a spare, and mount by reversing operations.
The extractor and extractor spring can also be removed without stripping gun as follows:—
1st.— Insert an empty cartridge case in the ejection slot, perpendicular to chamber. 2nd.— Close breech gently, i.e., by holding it back with cocking handle, on to empty cartridge case, thus giving access to extractor and extractor spring. 3rd.— Remove extractor spring and extractor by means of hand extractor.
Replace defective part by a spare, cock the gun and withdraw empty cartridge case.