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I gave up on my first attempt of an AR chambered in 50 Beowulf that was assembled with premium parts, twice. Multiple barrels, bcc's, upper receivers, tons of different mags, gas blocks, buffers, buffer springs, ammo, I'm sure I've missed something else. So, I decided to try a BCA complete factory built rifle just to give one last shot. I now FIRMLY believe that this cartridge will never be reliable in any AR platform. The issue, always, every time, has been that when a mag is inserted and the bolt dropped it will not go into battery. I try both methods, bolt release and pulling charging handle to release. Here's a pic of what happens, alway, every time regardless of brand of ammo, gun, BCG, magazine.