The Rock River Arms LAR-15M All Terrain Hunter Upper Receiver is a pinnacle of precision and performance for firearm enthusiasts. Designed with a .223 Wylde chamber it adeptly accommodates both 5.56mm and .223 caliber rounds ensuring versatility and reliability. This upper receiver boasts a forged A4 construction providing robust and durable support for rigorous use. Its 18-inch heavy match stainless steel barrel is cryogenically treated to enhance accuracy and longevity featuring a 1:8 twist rate ideal for stabilizing a wide range of bullet weights. The RRA Operator muzzle brake with a 1/2x28 thread reduces recoil and muzzle rise allowing for quicker follow-up shots. Equipped with a low-profile gas block the system maintains a sleek profile while ensuring reliable cycling. The included 13-inch extended lightweight free float rail is M-LOK compatible offering ample space for customization and accessory attachment. Completing this high-performance package is the included bolt carrier group and charging handle assembly making it a comprehensive solution for sharpshooters seeking excellence.