AR Crew: Bolt/barrel issues v. won't go into battery Got all the parts to make my new EBR and am having a pretty large problem. The BCG will not seat all the way into the upper and the cause seems to be the bolt not wanting to rotate in the barrel. The carrier slides freely, that little key rotates fine, but when I stick just the bolt into the upper/barrel, I cannot rotate it at all. The barrel is aligned properly in the upper and the nut torqued down to 65 ft-lbs, so as far as I can tell the barrel is properly mounted in the upper. This is a DPMS Lo-Pro upper with a brand new JP Rifles stainless barrel (.223 Wylde chamber) and a brand new LMT BCG. I plan to try a friend's Bushmaster BCG in it tomorrow, but does anyone have any ideas as to why this setup isnt working?