It may be related to the Model 82A1/M107, but the M107A1 is far from a simple evolution. Driven by the demands of combat, every component was re-engineered to be lighter yet stronger. The result? A high-performance rifle that weighs four pounds less than the original M107, but is every bit as tough. An all-new bolt carrier group has been designed that is key to making the rifle suppressor-ready. Its steel four-port muzzle brake is engineered to work seamlessly with a quick-attach Barrett .50 BMG Suppressor. The lightweight aluminum upper receiver features an integrated, rigid 27 MOA optics rail. Inside the upper receiver, the bolt carrier rides on a hardened steel, anti-wear strip for added durability. A thermal-guard cheek piece protects the user's face from extreme heat or cold.