Great, but only with a piston ar. - POF USA AR-15 Roller Cam Pin Assembly

This is a really high quality piece, but you need to remove the gas key for a regular(DI) AR every time you want to break down and clean the BCG. It was meant for piston guns that don’t require as much regular cleaning maintenance of the BCG. Basically, if you have a piston gun, this is a great drop-in piece, but if you have an AR with the DI mechanism, you’ll have more work ahead of you to clean. I recommend getting THEIR improved gas key and can pin set for a DI AR. Otherwise, this is a fantastic product with amazing materials and build quality. It really improves the feel of the action. It feels smoother!