11-18-2019, 01:18 PM
You lapped the upper so the bolt should be seating in the barrel extension square. Is the barrel over gassed, do you know the diameter of the gas port and are you using an adjustable gas block? The 16 inch Faxon Group Buy barrels had .078 inch gas port set at mid length. Are you using a suppressor and what buffer and spring are you using?

