Two failures: Broken S&W 1911, Case head seperation in a XD. August 12, 2013 by Howard S&W 1911 broken slide stop: The pistol was new, and the part failed in the first two shots. Case head separation in a .357 sig XD.Case head separations are more often seen in machine-guns and reloads. In this case it was factory ammo. As always, test your equipment, practice, and have back ups.