Double Star Ar-15/M16 Accessory Rail Gas Blocks

Lightweight gas blocks with integral MIL-STD 1913 Picatinny rails expand your AR’s accessory mounting options without adding excess weight or bulk. Lets you mount a backup iron sight, weapon light, laser sight, folding bipod, vertical grip, and other tactical accessories. Standard models fit barrels with .750" O.D. at gas port. 2-Rail Two-piece, clamp-on design with top and bottom rails doesn’t require removal of flash hider to install or remove. Clamps securely in place with four hex-head cap screws for a rock-solid installation that won’t shift under recoil. Circular cutouts in the sides reduce weight without compromising strength. 4-Rail Innovativ Mfg: Double Star SPECS: Standard 6061 T6 aluminum, hardcoat anodized. Fits barrels with .750" O.D. 2-Rail Matte black finish. 17/8" (4.8cm) long, 1.2" (3cm) wide, 1 3/4" (4.5cm) high. 2.6 oz. (74g) weight. 4-Rail Satin black PTFE-impregnated finish. 17/8