This ends the automatic cycle of fire until the trigger is squeezed again. If the trigger is released, the hammer moves forward and is caught by the nose of the trigger. The bottom part strikes the top of the sear and releases the hammer, causing the rifle to fire automatically. The bottom part of the automatic sear catches the upper hammer hook and holds it until the bolt carrier group moves forward. The center cam of the selector depresses the rear of the disconnector and prevents the nose of the disconnector from engaging the lower hammer hook. Once the trigger is squeezed and the round is fired, the bolt carrier group moves to the rear and the hammer is cocked. The functioning of certain parts of the rifle changes when firing automatically. When the selector lever (Figure 2-12) is set on the AUTO position, the rifle continues to fire as long as the trigger is held back and ammunition is in the magazine. purchased the rights to the AR-15 from, and currently uses that designation only for semi-automatic versions of the rifle. The rifle was adapted for semi- and full-automatic fire. The trigger must be squeezed again before the next round will fire. M16 RifleM-16 Rifle Blueprints 1M-16 Rifle Blueprints 2The M16 rifle, officially designated Rifle, Caliber 5.56 mm, M16, is the United States military select-fire adaptation of the rifle. This prevents the hammer from following the bolt carrier forward and causing multiple firing. Then the disconnector rotates to the rear and down, disengaging the hammer and allowing it to rotate forward until caught by the nose of the trigger. When the hammer is cocked by the recoil of the bolt carrier, the disconnector engages the lower hook of the hammer and holds it until the trigger is released. It is attached to the trigger and is rotated forward by action of the disconnector spring. The disconnector is mechanism installed so that the firer can fire single rounds in the M16A1 and M16A2 rifles.
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