Gas Port

STEP 5: Unlocking (Figure 2-8). As the bolt carrier moves to the rear, the bolt cam pin follows the path of the cam track (located in the bolt carrier). This action causes the cam pin and bolt assembly to rotate at the same time until the locking lugs of the bolt are no longer in line behind the locking lugs of the barrel extension.

Figure 2-8. Unlocking.

Figure 2-8. Unlocking.

Mechanical Design Unclonable Function

STEP 6: Extracting (Figure 2-9). The bolt carrier group continues to move to the rear. The extractor (which is attached to the bolt) grips the rim of the cartridge case, holds it firmly against the face of the bolt, and withdraws the cartridge case from the chamber.

STEP 7: Ejecting (Figure 2-10). With the base of a cartridge case firmly against the face of the bolt, the ejector and ejector spring are compressed into the bolt body. As the rearward movement of the bolt carrier group allows the nose of the cartridge case to clear the front of the ejection port, the cartridge is pushed out by the action of the ejector and spring.

Figure 2-10. Ejecting

STEP 8: Cocking (Figure 2-11). The rearward movement of the bolt carrier overrides the hammer, forcing it down into the receiver and compressing the hammer spring, cocking the hammer in the firing position. The action of the rifle is much faster than human reaction; therefore, the firer cannot release the trigger fast enough to prevent multiple firing.

Figure 2-11. Cocking.

COCKING WHEN TRIGGER IS HELD BACK DURING SEMIAUTOMATIC FIRfNG

Figure 2-11. Cocking.

COCKING WHEN TRIGGER IS HELD BACK DURING SEMIAUTOMATIC FIRfNG

M16a2 M16a1 Rear Sight
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