Nothing in steel. Avoid too much +P. Use popular brands and the PX4 should be able to shoot them. Google PX4 40 cal bad ammo. Some folks have guns that will shoot anything, some have a gun that can only shoot certain brands. If your's is picky, shoot 300 rounds then try branching out. Might just have been exceptionaly tight an finally loosened up. May be there was burr that finally wore down, who knows. If a problelm persist, send it in.
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