Micksixnine

I did remove the extractor and the ejector before testing. Would anyone with calipers be willing to check their lug height and bolt face depth (where the case or go guage seats)? My bolt has a lug height of .315" and seat depth of .128".

Same issues with my GB-purchased NB BCG. I have a brand new build with an SI Defense GEN4 matched upper/lower set with an 18.5" Lightweight chrome lined FA Criterion barrel. I have Forster Go and No Go guages and I cannot even close on the Go guage. I can close on an empty case but it is extremely tight. I was barely able to get the bolt back out. Does anyone know what the mil-spec dimensions of the bolt lugs are supposed to be? I'm guessing these bolts are at the high end or out of spec??