This is the OEM front flip sight that is equipped with the KRISS Vector and DEFIANCE firearms. 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 DEFIANCE 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.