Midwest Industries Alpha Light Mount, Fits Barrels with Diameter .580 - .700, 2.1 1913 Rail on Each Side, Black MI-AK-01 The Midwest Industries AK Light & Laser Mount is a Rock-Solid Way to Mount Your Favorite Light. This Mount Fits Barrels with Diameters From .580 to .700. Each Side provides 1 2.1" 1913 Rail. Lightweight" rugged construction of 6061 aluminum" Hardcoat Anodized.