IMPROVED COMPONENTS: Bolt and Bolt Carrier, Hard Stop Ejector, Bolt Index Pin, Hydraulic Buffer. Designed to be used with a suppressor, this one-of-a-kind rifle allows you to combine signature reduction capabilities with the flawless reliability of the original Barrett M107, but with a rifle weight reduction of 5 pounds. An all new bolt carrier group has been designed and is key to making the rifle suppressor ready. Its steel four port cylindrical muzzle brake is engineered to work seamlessly with a quick attach Barrett QDL Suppressor. The lightweight aluminum upper receiver features an integrated 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. The rear barrel stop and front barrel bushing are bolted and bonded with a high strength compound. A titanium barrel key and fully-chrome-lined bore and chamber add to the rifle's durability. The newly designed titanium and polymer monopod is adjustable from either side. The M107A1 rifle's lower receiver includes an aluminum recoil buffer system that's optimized for use with the Barrett QDL Suppressor. The bolt carrier's components are protected with a mix of ultra hard coatings and advanced nickel Teflon plating that increases lubricity, is corrosion resistant and greatly eases cleaning. Numbered witness holes on the magazine are just another example of how even the smallest detail makes a powerful difference.