BOWDEN TACTICAL AR-15 Cornerstone Series 15" Flat Top Hand Guard

BOWDEN TACTICAL AR-15 Cornerstone Series 15" Flat Top Hand Guard in black hard coat anodize. Barrel nut torque spec is 40 to 60 lbs; no timing of gas tube allows for a lower than mil spec setting. Handguard clamp screws torque setting is 32 inch-lbs (about 1/4 turn past snug with long-handled Allen wrench). Standard comes with a full-length Picatinny rail along the entire length of the rail. The Cornerstone hand guards are slim and lightweight, American made from American sourced 6061-T6 extruded aluminum and hard-coat anodized per MIL-A-8625 Type III Class II. Weight is approximately 9.5 oz for the 15" model and overall width is 1.5 inches. ID is 1.3 inches to fit most low-profile gas blocks. M-LOK slots at 3, 6 and 9 positions are MAGPUL standard compatible. Includes 4140 pre-heat treated steel barrel nut with black nitride coating. All mounting hardware and instructions included. Not compatible with piston-driven rifles. 100% warranty against defects.