The Midwest Industries G4 M-Series free float M-LOK handguard is a great choice for a new build or to dress up an existing modern sporting rifle. The super slim handguard has seven sides of Magpul M-LOK slots and includes one five slot M-LOK polymer Picatinny rail section. The handguard is constructed from 6061 aluminum for a lifetime of rugged use. It is fully dehorned for a smooth non-abrasive comfortable feel.Features: Precison machined 6061 aluminum Length: 10.5" Seven sides of M-LOK slots Mil-Std 1913 Picatinny top rail Five anti-rotation QD sling swivel sockets Patent pending torque plate system 1.5" outside diameter 1.3" inside diameter Made in the USA BlackIncludes: Proprietary barrel nut Barrel nut tool One 5-slot Magpul M-LOK Picatinny rail section