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Depends on the DI setup
Mates gun almost yars fillings out, but my midlength 16" is smooth as silk even though its quite overgasses
Going to play with a rifle length 16 when I'm back and see ho it...

I've seen an NEA that wouldnt take a Yank upper without filing or bashing the pins in, one without a staked gas key that was loose, and another that had many issues with cycling and FTF than were...