This is a full size clone of the standard 1911 .45 ACP. The weight is less than the original 1911 because both the slide and the frame are constructed of aluminum alloy. The lighter slide in particular also allows for reliable functioning it has much less mass for the recoil action of the diminutive .22LR round to function. The internal components of the 1911-22 are all steel of course. The barrel is fixed to the frame to provide better accuracy. The fixed barrel also eliminates some not necessary parts found in the original .45 which was designed for full disassembly due to battlefield conditions. Magazines are made of industrial-grade polymer and have been proven in extensive testing to be incredibly reliable as the polymer forming process ensures they are identical thus eliminating steel assembly and fit variances. 5" Barrel, hard shell case, 10+1 rounds, 2 mags included.