Do you own a GLOCK pistol? A 1911? Would you prefer a GLOCK carbine? Well MechTech Systems of Kalispell, Montana has a C.C.U. for you. That’s Carbine Conversion Unit (i.e. carbine conversion kit) and it does just that — converts your semi-auto pistol into a carbine with an ATF-legal 16-inch barrel, a stock, and rail space for red-dot optics and/or accessories. It isn’t a firearm, which means it can ship right to your door, all without changing the federal classification of your handgun. Sounds great on paper, but does it actually work? . . .