17'' inch m-lok clamping handguard rail new design float picatinny mount system black/red/tan

material : t6 6061 aluminum color choice : black anodized / red anodized / tan printed ( a little difference is acceptable due to different screen monitor ) notice : our unique color maybe can not match the same color of your other parts. hope you can accept :) length : 17 inch length / 430 mm barrel nut : steel barrel nut barrel nut thread spec.: 1-1/4-18 unc barrel nut inside diameter : 1.02'' ( 26 mm) barrel nut outside diameter : 1.35'' (34.4 mm)