Ncstar's ar15 keymod free-float handguard is low profile and features anodized aluminum construction for light weight and durability.This octagon-shaped handguard has seven sides of keymod slots, and a picatinny top rail at ar15 receiver height with laser-engraved t-slot numbers.It includes: barrel nut, handguard adapter insert, short and medium keymod to picatinny accessory rails, and main handguard tube.Installation requires a low profile gas block and an ar15 barrel nut wrench.It has a black anodized finish.This model is 10" long.It weighs 11.3 oz.With both accessory rails installed, and 8.8 oz without rails.Rails: 3 PicatinnyType: AR Rail SystemFirearm Type: AR-15Firearm Model: AR-15/M4Material: AluminumFinish: Black AnodizedFeatures: Picatinny RailPositions: 7Free Floating: Yes