Having fail to feed and fail to lock open after last round.
Local shop built gun.
First testing it wouldnt cycle but few times till jam. Took back to shop.
Got it back and cycled 110gn Fine but not 168gn or 150gn would jam. Bolt catch would realease at lightest bump of gun. Took back shop. Said it be few weeks before could try come up with solution and i juss left with it.
So it had an ar15 bolt catch. I figured that out and put correct one in.
Dpms? Lr308.
Local shop branded lower. (Think was 80% they finished)
20in barrel. (Unknown brand shop doesnt remember) Rifle length gas system .077 gas port
Buffer tube 7in internally. Buffer 3.8oz. Spring 9.5in 25coil
Adjustable gas block. Slr7 maxed out 15 clicks. Tried all settings
Forward assist is on backside of deflector and doesnt match where serrations are on bolt carrier. Can see silver plunger at bottom left of bolt
Also every casing is being shrunk in 2 spots towards neck can see rings in pic. Close to 100 all look this way doesnt matter gn. Or brand
From my measurements my gas tube is almost 1/2in in gas key on bolt and could go 1in?
JAM once every few rounds.
Casing 1 ring 1/4in from were bullet would be and another ring 1/4in from were gets bigger