The Century Arms AP51 is a semi-automatic pistol patterned after the HK 51 type, chambered in 7.62x51 NATO with an 8.3-inch barrel. It ships with a Magpul BSL brace and two 20-round magazines. The pistol is finished in black. 
 

Key Specifications 

• Brand: Century Arms 
• Model: AP51 
• Caliber: 7.62x51 NATO 
• Action: Semi Auto 
• Capacity: 20+1 
• Barrel Length: 8.3 inches 
• Color/Finish: Black 
   

Detailed Features 

• HK 51 type pistol configuration 
• 8.3-inch barrel 
• Magpul BSL brace included 
• Two 20-round magazines included 
• Short-barreled pistol configuration; transfer requires additional federal paperwork if converted to rifle

Owners of the Century Arms AP51 are drawn to the HK 51 type platform in 7.62x51 NATO for its novelty and the roller-delayed action that defines the type. Reliability with quality ammunition is generally reported as good, though the platform is known to be ammunition-sensitive.

The Magpul BSL brace is a common topic. Most owners find it a practical addition that improves control on a pistol this size, though some swap it out for aftermarket options. The 20-round magazine capacity is appreciated for range use.

The AP51 is considered a niche buy. Its 7.62x51 chambering in a pistol-format package makes it a conversation piece as much as a shooter, and the recoil is stout. Aftermarket support is limited compared to more common platforms, which is a recurring note among longer-term owners.