The Advanced Technology Slim AR-15 Free-Float Forend is precision CNC machined from 6061 T6 Aluminum and has a Mil-Spec Type III Anodized black finish. The included barrel nut is made from 4140V Steel. The weight of the forend is 7.2oz (not including the barrel nut). The forend has an integrated top Picatinny rail that mounts seamlessly with the upper receiver. The bottom and both sides have M-LOK slots for mounting rails or compatible accessories. All mounting hardware included. Made in the USA.