This Rifle Length Triangle Handguard fits 20-inch standard-length barrels. This two-piece drop-in handguard has a retro design that elevates almost any AR-15. Retro-style accessories, including handguards, have gained popularity among firearm enthusiasts who appreciate the historical significance and aesthetics of older firearms. This handguard allows modern firearms to replicate the look and feel of the vintage M16/M16A1 model.