Competing with a gas operated PCC (pistol caliber carbine) requires ammunition that reliably cycles even when some of the propellant gas is bled offto cycle the action (as opposed to a direct blow-back action). Our 158 gr. load is a duplicate of the Mk 144 Mod 0 subsonic 9mm that the original Super Vel company loaded for the Navy SEALs in Vietnam. The whole purpose of the Mk 144 was to duplicate the recoil impulse of standard 9mm ammunition, but at subsonic velocity. Run this load in a gas operated PCC, like a SIG MPX, and you’ll get stellar accuracy, superb reliability and a hard-hitting 9mm for taking down poppers.