This is the problem:
stove pipeYes, the barrel is a 16" inch DPMS I have had no problems in the past several years with this rifle, but just "rebuilt" it as a flat top.
The rifle only partially ejects the spent case, and then attempts to chamber a new round. The dent on the new round in the picture is the aftermath.
The specs are as follows:
DPMS 16" HBAR
Del-ton gas tube
YHM front sight/gas block
Bravo Company T-marked flat top upper
Bravo Company 6 Position stock
Bolt carrier from Gun Smoke Enterprises only markings are HM on the tops of the set screws for the gas inlet.
I also just got finished polishing the bore with 400 grit sandpaper as was suggested by another member.
Any other suggestions would be appreciated as I still have a few days to wait until the new bolt is in from Del-ton.