Make sure all your ammo is in spec before you shoot that critical match. One tool lets you check four popular calibers used in practical shooting matches: 9mm, .38 Super, .40 S&W, and .45 ACP. Helps you avoid jams, misfires, feeding problems, and other malfunctions caused by out-of-spec ammo that can cost you precious points?or the whole match. Machined aluminum with check holes precision bored using the same high-quality Clymer reamers EGW chambers its barrels with.