This is the OEM front flip sight that is equipped on the KRISS Vector SMG. This sight is extremely low profile designed to tuck completely out of vision when folded sitting a mere 12.7mm above the rail surface. The KRISS Low Profile Steel Front Sight features a very wide range of elevation adjustment accommodating for a large spectrum of firearms with various height over bore and sight radius measurements. Finally the large textured adjustment knob makes elevation changes with gloves simple and easy. Torque spec is 2 Nm (1.48 ft-lb). Sight adjustment based on 14.5″ sight radius. Top of post width 0.059″/1.5 mm.