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Stoppage/Malfunction

Probable Cause

Action/Remedy

Failure to feed ammunition.

• Lack of lubrication of operating parts.

• Defective or worn parts.

• Short recoil.

• Clean and lubricate parts.

• Replace parts.

• See 'short recoil' under stoppage/malfunction list.

Failure to chamber ammunition.

• Lack of lubrication of operating parts.

• Dirty chamber.

• Defective ammunition.

• Clean and lubricate parts.

• Clean chamber.

• Replace ammunition.

Failure to lock bolt.

• Lack of lubrication of operating parts.

• Dirty chamber.

• Dirty locking recesses.

• Weak op rod spring.

• Clean and lubricate parts.

• Clean chamber.

• Clean recesses.

• Replace op rod spring.

Failure to fire ammunition.

• Defective ammunition.

• Defective firing pin.

• Defective trigger housing group.

• Replace ammunition.

• Replace firing pin.

• Repair trigger housing group.

Failure to unlock bolt.

• Dirty chamber.

• Lack of lubrication of operating parts.

• Insufficient gas.

• Follower arm pin worn.

• Follower arm bent or out of tolerance.

• Clean chamber.

• Clean and lubricate parts.

• Tighten gas cylinder lock screw, and/or clean or replace worn parts.

• Replace follower arm pin; verify pin hole diameter.

• Replace follower arm.

Failure to extract spent cartridge case.

• Dirty chamber.

• Defective ammunition.

• Broken extractor.

• Clean chamber.

• Replace ammunition.

• Replace extractor.

Failure to eject cartridge case.

• Broken ejector or spring.

• Short recoil.

• Replace ejector or spring.

• See 'short recoil' under stoppage/malfunction list.

Failure to !+#% hammer.

• Defective trigger housing group.

• Short recoil.

• Repair trigger-housing group.

• See 'short recoil' under stoppage/malfunction list.

Cartridge clip inserts with difficulty.

• Deformed cartridge clip.

• Broken clip ejector.

• Interference between bullet guide and follower arm.

• Replace.

• Replace.

• Replace bullet guide or follower arm.

Short recoil (op rod does not fully cycle).

• Undersized or out of round op rod piston.

• Oversized gas cylinder.

• Undersized barrel at gas port.

• Carbon in gas cylinder.

• Carbon or foreign matter in gas port of barrel.

• Op rod assembly binding.

• Leak in gas cylinder lock screw with valve.

• Defective op rod spring.

• Bolt binding.

• Distorted or damaged receiver.

• Replace op rod assembly.

• Replace.

• Rebarrel firearm.

• Clean.

• Clean.

• Replace op rod assembly if damaged, or relieve wood from gun stock assembly, where op rod binds on wood.

• Replace gas cylinder look screw with valve.

• Replace op rod spring.

• Remove burs from bolt.

• Repair or replace receiver.

Bolt fails to close tightly.

• Extractor does not open enough to pass over rim of cartridge.

• Op rod assembly binding.

• Weak or broken op rod spring.

• Rust or dirt in chamber.

• Damaged cartridge, or frozen ejector.

• Damaged/deformed bolt and/or receiver

• Insufficient headspace.

• Clean bolt assembly.

• Replace op rod or relieve wood from stock assembly where op rod binds on wood.

• Replace op rod spring.

• Clean barrel chamber.

• Repair or replace ejector.

• Replace bolt or receiver.

• Replace bolt assembly by selective fit or headspace.