Hi i got to share this with everyone. I purchased 2 new dpms lr308 20" and 16" I got a little crazy and bought 2 jpenhanced 308 bolts from brownells. well i installed them didnt get a chance to try them out until this past weekend. So i loaded my brand new mags i brought and tried both. released the bolt catch and the bolt didnt full close, hmmm. thats right i slammed partly closed, i extracted the round and tried another round, let the bolt catch go and the bolt didnt fully close. was it my ammo i am using 7.62x51 yugo, then tried 308 winchester same thing. could my bolt be incompatable. i called jpenterprises and i must say they were excellent. we spoke about 10 minutes going through different causes. I agreed to purchase a go/no and field gauge and see the result. well i just remove my ejector, opened my new go gauge dropped it in and let the bolt go. no close so then i tried pressing a little on the back of the carrier still it wouldnt close, I remove th go gauge and the bolt closed fully with a little pressure on the carrier. can someone suggest the reason for this, rather than having my chamber reamed i going to use the oem dpms bolts.