Mega Arms 308 Barrel problem

[Gaspipeshooter]

The .308 build I did, I got the BCG from CMT and sent them the upper and they headspaced it. Their BCG is of high quality so far as I can see.

[Diazm50]

Could it be the upper receiver not perfectly square where the barrel mates up?

[stihl2much4u]

Figured I'd let you guys know the problem has been solved. I bought the bullet and got a jp bcg. Just came in from shooting and my groups are tight and consistent, finally! Thanks again for all the help. Here is a list of components on the rifle. Everything seems to be working in sync now

Upper&lower Mega Maten
Barrel 20" Mega
Adjustable gas block syrac
rail fortis switch
muzzle break lantac dragon (worth every nickel)
Bolt jp low mass
buffer jp silent spring
stock luth-ar
grip magpul moe+
trigger geissele sd-e
standard lpk