A bit of an oddball............the Mech-Tech Carbine Conversion in .460 Rowland, and it will also shoot 45ACP loads. It's a blowback design that uses a 1911 lower, other models will take a Glock lower. Hot loads will push a 185-JHP to nearly 2000 fps, 230's to 1650 or more. I built it as a pig hunting/HD rifle. Lots of fun to plink with, and scary-accurate.