Failure To Feed First Round Bolt Carrier Not Fully Closed A Double Feed Of Two Live Rounds

Double Feed Bolt Override

the chamber. Other causes could be: damaged or broken action spring, exterior accumulation of dirt in the lower receiver extension, or fouled gas tube resulting in short recoil.

Corrective action. Applying immediate action usually corrects the malfunction. However, to avoid the risk of further jamming, the firer should watch for ejection of a cartridge and ensure that the upper receiver is free of any loose rounds. If immediate action fails to clear the malfunction, remedial action must be taken. The carrier should not be forced. If resistance is encountered, which can occur with an unserviceable round, the bolt should be locked to the rear, magazine removed, and malfunction cleared — for example, a bolt override is when a cartridge has wedged itself between the bolt and charging handle. The best way to relieve this problem is by—

• Ensuring that the charging handle is pushed forward and locked in place.

• Holding the rifle securely and pulling the bolt to the rear until the bolt seats completely into the buffer well.

• Turning the rifle upright and allowing the overridden cartridge to fall out.

2. Failure to Fire Cartridge.

Description. Failure of a cartridge to fire despite the fact that a round has been chambered, the trigger is pulled, and the sear has released the hammer. This occurs when the firing pin fails to strike the primer with enough force or when the ammunition is bad.

Probable causes. Excessive carbon buildup on the firing pin (Figure 2-15 A) is often the cause, because the full forward travel of the firing pin is restricted. However, a defective or worn firing pin can give the same results. Inspection of the ammunition could reveal a shallow indentation or no mark on the primer, indicating a firing pin problem (Figure 2-15B). Cartridges that show a normal indentation on the primer but did not fire indicate bad ammunition.

Figure 2-15. Failure to fire.

A. Carbon or Fouling Buildup.

Figure 2-15. Failure to fire.

A. Carbon or Fouling Buildup.

B. Various primer indents.
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