ar-15 failing to extract due to dirt

[Dsparil]

what is the biggest source of this problem? not cleaning the inside of the receiver? inside the lug area? or the bolt carrier group itself?

 

[Texas1911]

Lug area is pretty important. On our rental gun there have been a number of failures due to grim build-up on the lug / bolt face area. The receiver doesn't seem to be a big issue, not as much as the crud on the carrier and lugs.

 

[ambidextrous1]

Yes, buildup on the bolt face is really grim!

 

[jdh]

Shooting cheap, coated steel cased ammo.

Build up under the extractor.

 

[gladi8r]

Take your bcg apart and clean the bolt face real good and inspect the extractor to ensure it is not chipped also if you are shooting laquer coated ammo take a boar brush with some sweets 7 62 solvent and give the boar where the lugs are a good scrubbing.