Malfunctions

A malfunctioning SAW is a weapon that is not firing properly. Defective ammunition or improper operation by the firer is not a malfunction. Two of the more common malfunctions of the SAW are sluggish operation and uncontrolled fire (runaway gun). Table 4-1 shows these malfunctions, their probable causes, and corrective actions.

a. SLUGGISH OPERATIONS. Sluggish operation of the SAW usually is due to excessive friction caused by carbon buildup, by lack of proper lubrication, or by burred parts; or to excessive loss of gas caused by a loose gas cylinder or gas regulator.

A temporary solution to sluggish operations due to carbon buildup is to set the gas regulator to the MAXIMUM position, fire approximately 50 rounds, and then reset the gas regulator back to the NORMAL position.

b. UNCONTROLLED FIRE (RUNAWAY GUN). Uncontrolled fire (the weapon continues to fire after the trigger is released) is usually caused by the firer not pulling and holding the trigger all the way to the rear. This results in the sear not clearing the sear notch, which causes wear to both parts. The following are immediate actions for uncontrolled fire:

(1) The firer holds the weapon on target and fires the remaining ammunition if weapon is near the end of the link bolt or magazine capacity.

(2) The firer stops the weapon from firing by breaking the ammunition belt (twist quickly in either direction).

(3) The firer releases the magazine.

(4) When the weapon has stopped firing, the firer clears the weapon and checks it to find the cause of the malfunction.

WARNING

NEVER RELOAD A RUNAWAY WEAPON UNTIL IT HAS BEEN REPAIRED.

TABLE 4-1. MALFUNCTIONS

MALFUNCTION

PROBABLE CAUSE

CORRECTIVE ACTION

Sluggish operation

Dirty receiver.

Clean and lubricate.

Lack of lubricant.

Lubricate.

Carbon buildup in gas system.

Clean gas regulator, piston, and cylinder.

Failure to cock or runaway weapon

Broken, worn, or burred sear.

Notify organizational maintenance.

Piston assembly sear notch worn.

Notify organizational maintenance.

Sear stuck in trigger housing.

Notify organizational maintenance.

Short recoil.

Clean and lubricate bolt and slide assembly.

Carbon buildup in gas system.

Clean gas regulator, piston, and cylinder.

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  • Carolyn
    When firing weapon it seems sluggish and then stops firing?
    2 months ago

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