The PTR 91 A3S is a semi-automatic .308 Win (7.62x51mm) rifle based on the HK91 / G3 roller-delayed blowback design. The action is reliable across a wide range of ammunition and conditions, which is one reason the platform has stayed popular decades after the original German design. 
 

Key Specifications 

• Model: PTR 91 A3S 
• Caliber: .308 Win (7.62x51mm) 
• Action: Semi-Automatic 
• Barrel Length: 18 inches 
• Capacity: 10 rounds 
• Weight: 9.5 lbs (unloaded) 
• Finish: Black powder-coated over parkerizing 
• Manufacturer: PTR 
• UPC: 897903003043 
   

Features 

The roller-delayed blowback system reduces felt recoil compared to a direct-impingement or gas-piston .308, though at 9.5 lbs the rifle is already on the heavier side. The 18-inch stress-relieved barrel has a tapered contour and a threaded muzzle for suppressors or muzzle devices. A 7.5-inch steel Picatinny rail mounts over the receiver for optics. The polymer slim-line handguard is lightweight and dissipates heat. The full-auto bolt carrier is heat-treated for long-term durability. 
 

Usage 

At 9.5 lbs unloaded, this is not a light rifle. It's built for durability and reliability, not portability. The roller-delayed system runs well with surplus .308 military ammunition, which makes it a practical choice for high-volume range use. The 18-inch barrel is shorter than a traditional 20-inch .308 rifle but longer than many tactical configurations, giving a good balance of velocity and maneuverability. Standard HK91/CETME-pattern magazines are widely available.

The PTR 91 A3S draws a consistent pattern of feedback from owners and shooters familiar with the HK91 platform.

Build quality is the top strength cited. The construction is considered durable and the finish holds up well. Accuracy gets consistent praise across ranges, with tight groupings reported in both target shooting and hunting use. The .308 Win caliber and roller-delayed action together are appreciated for reliable performance on medium and large game.

On the critical side, weight is the most common complaint. At 9.5 lbs unloaded, it's heavy by modern rifle standards, and some buyers underestimated this. Magazine sourcing comes up occasionally; HK91-pattern mags are available but less ubiquitous than AR-10 or M14 pattern mags, and quality varies by brand. Recoil in .308 is real and a few buyers found it more noticeable than expected. Initial optic setup and zero can require some patience for users new to the platform's rail system.