Pro2A Tactical has the latest 12.7x42 (50 Beowulf) AR-15 NR Side Charging Uppers. The 50 Beowulf is the largest 50 caliber round designed for the AR-15 platform and offers great penetration capabilites at close distances. It is the perfect round for taking down large game or for protection in the Alaskan Wilderness. All of Pro2a Tactical Uppers are made in the USA and backed by our limited lifetime warranty.