The Gorilla Firearms lightweight handguard is designed to provide lightweight durability to your AR. The ergonomic design provides an excellent feel for confident shot placement. Free Float Design. Anti-slip design keys into barrel nut with no timing of barrel nut required. The AR-15 models have a combination of Mlok and Picatinny. The AR-10 model is all Mlok. Mil-spec Hardcoat Anodize. 7075 Barrel Nut with hardcoat anodize. 4 built in QD Swivel mounting points. AR-15 available in 9.5″ and 12.5″. AR-10 available in 14.87″.