[bd111]

Have you kept the gas system and chamber clean of debris and carbon build-up? Boltface and extractor clean of brass fragments? Is the gas plug screw down tight? Barrel's gas port free of carbon and copper/lead? Op rod spring gone weak? At 2K rounds it's a good time to replace it anyway. I don't know if you need to replace all the bolt guts or if they have anything to do with your immediate issue, but it can't hurt anything to swap in GI parts for the commercially-made ones..