Century Arms RI5601AX CA-3 7.62x51mm NATO 20+1 18" Black Threaded Barrel, Black Steel Receiver, Fixed Black Synthetic Stock & Grip, A2 Birdcage Flash Hider

The Century Arms RI5601AX CA-3 in 7.62x51mm NATO is a semi-automatic rifle built on the proven G3 platform, combining original military surplus components with American-made precision manufacturing. This 20+1 capacity rifle features an 18-inch threaded barrel with A2 birdcage flash hider, delivering consistent performance across standard NATO intermediate-power loads while maintaining moderate recoil management. The fixed black synthetic stock and grip provide ergonomic stability for sustained accuracy during extended shooting sessions.

The rifle combines heritage and reliability through its construction philosophy: original surplus components including the fixed stock, forend, adjustable front sight, and rotary aperture rear sight are paired with PTR-manufactured American components—the trunnion, stamped receiver, barrel, flash hider, hammer, sear, and charging handle. This hybrid approach preserves the G3's legendary durability while meeting compliance requirements through a modified trigger group. The black steel receiver resists corrosion in field conditions, and the 12.5-pound weight provides adequate mass for recoil absorption without excessive burden during transport or tactical movement. The 18-inch barrel is threaded 5/8"-24 (common to 7.62x51mm rifles), enabling suppressor or muzzle device compatibility.

This platform serves shooters seeking a battle-tested rifle design with modular upgrade potential. Military veterans, law enforcement trainers, and competitive shooters favor the G3 architecture for its simplicity, interchangeability of components, and inherent accuracy at intermediate ranges. The 7.62x51mm NATO cartridge delivers superior penetration and range compared to 5.56 platforms, making this rifle suitable for precision roles, hunting applications, and marksmanship training where heavier bullet performance is prioritized. The CA-3 configuration—with fixed stock and original sights—appeals to those who value authenticity and proven ergonomics over modern modular accessory systems.

The G3 platform represents a significant segment of the global rifle market, with decades of combat service history. Ammunition availability for 7.62x51mm NATO is broad across commercial channels, and aftermarket support for parts and maintenance is mature. Buyers should verify local and state compliance before purchasing, as some jurisdictions restrict semi-automatic rifles with certain features or capacities.