Specifi cally designed for M-16 & AR-15. Features a built-in bullet drop compensation system that is calibrated to 500 yards in 100 yards increment. Has an integrated base that easily mounts to the carry handle of the gun. 30/30 Reticles • Built-in M16 / AR-15 Base • Fully Coated Optics • Compact Size • High Density Optical Glasses for crisp edge-to-edge clarity • 100% Waterproof, Fogproof & Shockproof