J P Enterprises Ar-15/M16 Adjustable Gas Blocks

Replaces the factory front sight/gas block and allows you to tune the gas system for smoother cycling and operation. Especially critical on match and varmint rifles when shooting both factory and custom-loaded ammunition. Simple setscrew lets you control the gas flow, so you can customize the setting for each load. Hex head setscrews clamp the block securely to the barrel. Installation instructions included. Standard model features a topside Picatinny rail for mounting flip-up front sights and other accessories. Available in lightweight aluminum or stainless steel for additional muzzle weight. Fits barrels with .750" O.D. at gas block. Heavy – Alum Mfg: J P Enterprises SPECS: Standard – Available in 6061 T6 aluminum, hardcoat anodized, matte black, or 416 stainless steel, natural silver or black oxide finish. 17/8" (4.7cm) long, .950" (2.4cm) wide. .750" (19mm) I.D. Heavy – Aluminum, hard anodized, matte black. 17/8" long, 1&frac