Sturm Ruger AR-556 18" Upper Receiver Assembly (5.56mm NATO) with 15" Free-Float M-LOK Handguard
This complete Ruger AR-556 18" upper receiver assembly is built around an 18" cold hammer-forged alloy barrel with 5R rifling and a salt bath nitrided finish, paired with a rifle-length gas system and Ruger muzzle brake. The Ruger 15" free-float handguard features M-LOK attachment slots and a continuous top Picatinny rail.
Included with this unit: upper receiver assembly, bolt carrier group (BCG), and charging handle.