Kaboom from my X5. 20 rounds, 9 stovepipes, 1 kaboom, 1 Failure to feed nose high. Anyone that has one have any problems? Is your lockup extremely tight like mine? Factory works fine, soft shooting loads not enough to cycle the gun properly. At least the first day which was only 20 rounds. Put another 20 through of various loads and worked. It risking though, calling Sig tomorrow.