From personal experience, I can tell you that shooting a rifle cartridge through a handgun-length barrel is not necessarily a pleasant experience! The muzzle blast and the recoil on the handgun frame made me shell-shocked and powder-burned! The barrels are too short for all the powder to burn, so you have a hand-held flame thrower working for you. I have shot them in .223 and 7.62X39, and I never want to do it again. Of course, I'm a card-carrying wimp, but I assure you that the reason all these AR pistols are hitting the market is because the owners went out and shot a few magazine's worth of ammo through them, and decided a full length, or at least a bull-pup length barrel was what these cartridges were designed for! If you're tempted to buy one, do yourself a favor and at least insist on a test firing of a full, 10-15 round magazine, so you can determine whether or not it's the way to go.
Edited by mikei (09/10/15 04:47 PM)