Home Forums Hunting & Shooting AR and Tactical Rifles 6.5 Grendel - 20 in. PSA Upper

I built three AR's in 6.5 Grendel a few years back. All used RR lowers, and the first was a bone stock Alexander Arms upper. Second used a billet upper with an Alexander Arms premium barrel and an Adams Arms gas piston operating system. The last was a mid length carbine , standard type upper and White Oak barrel. Comparing the two long guns, I cannot tell much difference in the gas piston and impingement systems

I did initially have trouble with new sized brass, some Lapua, some reformed from IMI 762x39 brass, not chambering completely, and getting stuck in the chamber. My solution was to slowly by hand grind some metal off the upper surface of my RCBS shell holder, so the case could enter my sizing die a little more. I do not know how much i removed, just went slow and got to the point where a sized case would chamber and extract properly in all three rifles..