The Ruger SFAR in .308 Winchester is a semi-automatic rifle with a 20-inch cold hammer-forged barrel. It weighs 7.3 lbs and has a Type III hard-coat anodized black finish. Capacity is 20+1 (includes one Magpul PMAG). The receiver is 7075-T6 aluminum. 
 

Key Specifications 

• Model: Ruger SFAR 
• Caliber: .308 Win / 7.62 NATO 
• Action Type: Semi-Automatic 
• Barrel Length: 20 inches 
• Capacity: 20+1 rounds (includes one Magpul PMAG) 
• Weight: 7.3 lbs. 
• Finish: Type III Hard-Coat Anodized Black 
• Receiver Material: 7075-T6 Aluminum 
   

Detailed Features 

 
The bolt and barrel extensions are CNC-machined from high-strength super alloy steel. The barrel is cold hammer-forged chrome-moly with 5R rifling, which improves accuracy and makes the bore easier to clean than traditional 4-groove rifling. The Ruger Boomer muzzle brake redirects gas to reduce felt recoil. The free-float handguard has M-Lok attachment slots. The mid-length gas system has an adjustable regulator to tune cycling for different ammunition or suppressor use. 
 

Usage 

 
The 20+1 magazine capacity with the included Magpul PMAG is a practical spec for this variant. The adjustable gas regulator is a useful feature -- it allows the rifle to cycle reliably with both standard and suppressed configurations, and helps with ammunition flexibility. The 5R rifling in the 20-inch barrel is well suited for precision work at distance with .308.

The 20-inch SFAR with the 20-round Magpul magazine gets positive reception. Owners who specifically wanted a longer .308 platform with a higher-capacity magazine compared to the standard 10-round version appreciate this configuration.

The M-Lok handguard is frequently noted as a practical feature for adding accessories. Reliability across different .308 loads is reported positively, and the adjustable gas regulator gets particular praise from owners who run suppressors. Accuracy at 100-300 yards is consistently rated well for the platform.

Recoil is noted as more pronounced than 5.56, which is expected for .308. The muzzle brake helps but doesn't eliminate the difference. Pricing discussions and magazine compatibility (note: this variant uses PMAG .308 which is different from standard AR-15 PMAG) are the main cautions in user discussions.

I recently got my hands on the Ruger SFAR Gen 1 in .308, and I’m seriously impressed. This rifle feels incredibly light—almost like an AR-15—but delivers the power of a .308. The balance is excellent, and even with the big .308 rounds, the recoil is really manageable, thanks to the fantastic muzzle brake. I was able to run this rifle fast and smooth, without feeling like I was wrestling with it. The stock trigger is surprisingly good—smooth with a clean break. I added a Geissele charging handle and an H2 buffer weight to make it even better. It’s easily one of the most enjoyable AR-10s I’ve ever shot, delivering power without sacrificing maneuverability. Highly recommend this rifle for anyone looking for AR-10 performance in a lighter package.