The Barrett M107A1-S is a semi-automatic .50 BMG rifle built around Barrett's established anti-materiel platform. It chambers the full .50 BMG cartridge with a 10+1 capacity, a 29-inch barrel, and a 1:15" twist rate. At 29.8 lbs and 57 inches overall, this is not a rifle you carry lightly — the weight is a direct consequence of the caliber and the engineering required to manage it. 
 

Key Specifications 

• Brand: Barrett 
• Model: M107A1-S 
• Action: Semi-Automatic 
• Caliber: .50 BMG 
• Barrel Length: 29 inches 
• Overall Length: 57 inches 
• Capacity: 10+1 rounds 
• Weight: 29.8 lbs. 
• Frame Material: Synthetic 
• Receiver Material: Steel 
• Receiver Finish: Black Nitride 
• Finish Per Color: Flat Dark Earth Cerakote 
• Sights Type: Flip Up Rear Sights 
• Barrel Twist Rate: 1:15 inches 
   

Detailed Features 

The semi-automatic action allows follow-up shots without manually cycling between rounds — relevant at extended ranges where repositioning between shots costs time. The 29-inch barrel is optimized for .50 BMG ballistics and works with the integrated muzzle brake to reduce felt recoil to manageable levels. The receiver is steel with a black nitride finish; the exterior gets a Flat Dark Earth Cerakote coat that holds up in field conditions. Flip-up rear sights are included, though most buyers will run optics on a rifle like this.

The M107A1-S draws consistent respect in .50 BMG discussions, largely because Barrett has a well-established track record in the caliber and the rifle reflects that.

Accuracy and long-range performance are the most-cited strengths. At distances where most rifles run out of meaningful capability, the .50 BMG keeps going, and the M107A1-S delivers that consistently according to most owners.

Build quality also comes up frequently. The construction is solid — users note it holds up to hard use, and the Cerakote finish takes environmental abuse without issue.

Weight is the most common practical complaint. At 29.8 lbs unloaded, this is not a rifle you're carrying any distance without real commitment. Most owners treat it as a bench or supported shooting platform rather than a field carry gun, which is the rational approach for the caliber.

Recoil feedback is mixed. The muzzle brake does real work, but .50 BMG is still .50 BMG — shooters who haven't run the caliber before sometimes underestimate what's left after the brake. It's manageable with proper technique.

Price is acknowledged as high, and most discussions treat that as a given rather than a complaint — this is a specialized tool, and buyers generally know what they're getting into. Aftermarket support is good: optics, accessories, and spare parts for Barrett rifles are readily available.