2. General data.

Weight of rifle, 15 pounds 8 ounces.

Weight of magazine, empty, 7 ounces.

Weight of magazine, filled, 1 pound 7 ounces.

Length of barrel, 24 inches.

Over-all length, 47 inches.

Sights graduated to 1,600 yards.

Caliber bore, 0.30 inch.

Gas port from muzzle, 6 inches.

Rate of uninterrupted automatic fire (cyclic rate), 600 shots per minute.
Chamber pressure, 47,000 to 50,000 pounds per square inch.

Muzzle velocity, about 2,680 feet per second.

Habitual type of fire, semiautomatic.

Head space limits, 1.937 inches to 1.943 inches.
Length of recoil spring, 15.5 inches.

3. Sequence and method of stripping.-Steps in stripping will be taken in the following sequence:

a. Cock the piece.

b. Remove gas cylinder tube retaining pin.

c. Remove gas cylinder tube and forearm (let mechanism forward easily).

d. Remove the trigger guard retaining pin.

e. Remove trigger guard.

f. Remove recoil spring guide and recoil spring.

g. Push hammer pin through hammer pin hole in receiver.

h. Remove operating handle.

i. Remove hammer pin.

j. Remove hammer.

k. Remove slide.

1. Bolt guide pushed out. '

m. Remove bolt, bolt lock, and bolt link.

n. Remove bolt link pin and bolt link.

o. Remove firing pin.

p. Remove extractor and spring.

4. Detailed explanation of stripping.-Lay the rifle on the table, barrel down, pointing to the left. Cock the piece. This must be done in order that the gas cylinder tube may clear the gas piston and gas cylinder bracket, female. Turn the gas cylinder tube retaining pin spring (54) 90° in a clockwise direction and lift out gas cylinder tube retaining pin (53). Remove gas cylinder tube and forearm (118). Let the slide (45) forward very easily in order to release the tension of the recoil spring and avoid any damage to the rifle. Care must be taken during stripping and assembling to avoid working against tension of any springs. Turn the trigger guard retaining pin spring (12) 90° in a clockwise direction and lift out pin. Lift out the trigger guard

group. Remove the recoil spring guide (41) by pressing the right index finger on the checkered surface of its head and turning it until the ends are clear of the retaining shoulders. This may also be done by using the index finger of the left hand and the middle finger of the right hand. Line up the hammer pin holes on the receiver and the operating handle by inserting the point of the recoil spring guide or dummy cartridge in the hole on the operating handle with the right hand, press against the hammer pin (86) and push the slide backward with the left hand. The recoil spring guide will push the hammer pin through its hole in the receiver as the hammer pin registers with the latter. Remove the operating handle (88) by pulling straight to the rear. Push the hammer (85) forward out of its seat in the slide (45) and lift out of the receiver. Remove the slide (45) by pulling forward out of the receiver, being careful that the bolt link (82) is pushed well down, thus allowing the slide to clear. In removing the slide take care to avoid striking the gas piston or rings against the gas cylinder tube bracket, female (56). Force the bolt guide (72) out with the left thumb or point of bullet. Lift out the bolt, bolt lock, and bolt link by pulling slowly to rear end of receiver and up. Push out bolt link pin (83) and remove bolt link. Pull out the firing pin (76) from its way in the bolt (75). Remove the extractor (77) by pressing the small end of a dummy cartridge against the claw and exerting pressure upward and to the front.

5. Sequence and method of assembling.

a. Extractor and spring.

b. Firing pin.

c. Bolt link and bolt link pin.

d. Bolt, bolt lock, and bolt link.

e. Slide.

f. Hammer.

g. Hammer pin (far enough to register all holes).

h. Operating handle.

i. Hammer pin fully seated.

j. Recoil spring and guide.

k. Trigger guard.

1. Trigger guard retaining pin.

m. Cock the piece.

n. Gas cylinder tube.

0. Gas cylinder tube retaining pin.

p. Let slide forward easily.

6. Detailed explanation of assembling.-Replace extractor spring (78). Replace extractor (77) into its seat in the bolt. Place the bolt link (82) and bolt link pin (83) with the shoulder of the link against the flat surface of the bolt lock (80). Lift the bolt lock and replace the firing pin (76). Lay the piece barrel down and pointing to the left so that the piece is resting on the barrel and rear sight. With the bolt mechanism held in a perpendicular position, insert it in the receiver, forcing the end of the bolt under the ends of the bolt supports, and then press the bolt mechanism down so as to lie flat in its place. Push the bolt mechanism forward, swing the bolt link down, then replace the slide (45) and push it all the way back. With the hammer (85) resting between the thumb and the forefinger, lower and seat it properly in the receiver and push the slide forward. With the thumb and