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Message: <blockquote data-quote="jrock" data-source="post: 2173295" data-attributes="member: 78569">I can't speak to LR AR shooting but I built a varmint rig with a BCM upper and X-Caliber barrel. I did all the machining and improved the mating surfaces across the board. At 100 yards, it prints groups 1/4" and less everyday.  I haven't had the chance to stretch it out.  I was a skeptic that an AR could shoot that well.  I'm glad I tried it.  For LR shooting, I hear the gas system is the weak link in creating a wider ES.  If I was going to build an LR AR 15, I'd go with the ARC or 6mm Turbo.  Preferably, step up to the AR 10 platform and shoot a 6mm creed.</blockquote>