The Century Arms Atheris is an AR-15 style semi-automatic rifle chambered in 7.62x39mm, built with a 16.4-inch barrel and a detachable magazine feed for straightforward handling and familiar AR-15 ergonomics. It has a black synthetic stock and a threaded barrel for muzzle device compatibility, and it comes with two 30-round magazines. The rifle carries a compact overall length while keeping the standard AR-15 pattern controls. 
 

Key Specifications 

• Brand: Century Arms 
• Model: Atheris 
• Caliber: 7.62x39mm 
• Action: Semi Auto 
• Capacity: 30+1 
• Barrel Length: 16.4 inches 
• Color: Black 
   

Detailed Features 

• Detachable magazine feed, with two 30-round magazines included 
• Black synthetic stock for durable, low-maintenance use 
• Threaded barrel accepts compatible muzzle devices 
• Optic-friendly AR-15 style platform for mounting sighting systems 
• Compact overall length for AR-15 pattern handling 
• Familiar AR-15 controls carried over to a 7.62x39mm chambering

The Century Arms Atheris draws interest from AR-15 shooters who want a 7.62x39mm chambering without switching to an AK-pattern rifle. Reliability opinions are mixed: many owners report smooth cycling once the rifle is broken in and running quality ammunition, while others note that AR-15 platforms in this caliber can be pickier about magazines and ammo than a 5.56 build.

Ergonomically, the Atheris keeps the familiar AR-15 controls and a black synthetic stock that most owners find comfortable for range use. The threaded barrel and optic-friendly upper make it easy to add a red dot or other sighting system.

Value feedback leans positive since the rifle ships with two magazines and taps into the wide AR-15 aftermarket for stocks, grips, and optics, though a few owners wish Century included more from the factory.