Yankee Hill Machine Co., Inc. Ar-15 Gas Block Picatinny

Unique, all-steel gas blocks expand the versatility of your rifle by providing a variety of accessory rail and handguard mounting options. Especially helpful in customizing short-barrelled tactical rifles. Machined from bar stock for extra strength and rigidity, then mil-spec Parkerized for exceptional wear- and corrosion-resistance. One-piece, 4-Rail model features top/bottom and side rails that accept Weaver or Picatinny mounted, tactical accessories, including the Yankee Hill Gas Block Front Flip Sight. Secures to barrel with included setscrews. 2-Rail gas block is an easy-to-install, two-piece unit that clamps around the barrel using four hex screws; includes machined top and bottom P Mfg: Yankee Hill Machine Co., Inc. SPECS: Steel, mil-spec phosphate finish. Unless otherwise noted, fits .750" diameter barrels. 4-Rail – 1-7/8" (4.8cm) long, 1-1/4" (3.2cm) wide, 1-3/4" (4.4cm) high. 5.7 oz. (162 g) wt. 2-Rail – 1-3/4" long, 1-1/4" wide, 1-3/4&quot