The Barrett M107A1-S is a semi-automatic rifle chambered in .50 BMG with a 20" barrel, aluminum frame, and Flat Dark Earth Cerakote finish. Capacity is 10+1 rounds and unloaded weight is 28.7 lbs. It uses a recoil-operated semi-auto action with a muzzle brake to manage felt recoil, adjustable backup iron sights for windage and elevation, and a lightweight tactical stock. 
 

Key Specifications 

• Manufacturer: Barrett Firearms 
• Model: M107A1-S 
• Type: Semi-Automatic Rifle 
• Caliber: .50 BMG 
• Barrel Length: 20 inches 
• Capacity: 10+1 rounds 
• Weight: 28.7 lbs (unloaded) 
• Finish: Flat Dark Earth Cerakote 
• Frame Material: Aluminum 
   

Features 

 
The M107A1-S uses a recoil-operated action where the barrel and bolt travel rearward together on firing, cycling the action while reducing felt recoil compared to a fixed-barrel design. The muzzle brake adds further recoil and muzzle rise reduction, which matters when shooting .50 BMG. The adjustable backup iron sights cover windage and elevation, useful when optics are removed or fail. The aluminum frame keeps weight lower than an all-steel design, though at 28.7 lbs this is still a heavy rifle. The weight contributes to stability under recoil.

Discussions around the Barrett M107A1-S cover a consistent set of topics among owners and enthusiasts.

Accuracy and long-range performance are the most praised attributes. The .50 BMG caliber's capability at extreme distances is well-documented, and users consistently rate the rifle's precision highly for target shooting and precision applications. Build quality gets strong marks as well. Barrett's construction and material quality are widely respected, and owners report confidence in long-term durability.

Weight is the most common complaint. At 28.7 lbs unloaded, it's not a rifle you carry far, and handling in anything other than a supported position is awkward. Recoil is another frequent topic: the muzzle brake and recoil-operating system help, but .50 BMG still produces significant impulse that less experienced shooters find challenging.

Ergonomics reviews are mixed. The adjustable features help with fit, but some users feel certain aspects of the stock and grip could be improved. Cost is mentioned regularly. This is an expensive rifle, and most buyers acknowledge that, though the consensus is that performance justifies the price for serious long-range work.

Use cases discussed range from competitive long-range shooting to military and law enforcement applications to large game hunting. There's occasional debate about appropriate use contexts, but admiration for Barrett as a manufacturer is consistent across those discussions.