The BLACKHAWK. Flat Top Riser Rail-AR-15/M16 lets you set a rifle scope on your M16 or AR15 at the perfect mounting height. This Pica tinny Rail is built with super-tough aircraft-grade 6061 T6 aluminum and wrapped up with a Mil-Spec Type III hard-coat anodized finish. Easily attach and remove the BlackHawk Flattop Riser Rail with the quick detach model, or keep it semi-permanently mounted with the standard version. Either way, the BlackHawk Flat Top Riser Rail Mounting Base gives you a superior platform for mounting optics to your tactical rifle.