The Century Arms Centurion A4 is a piston-driven semi-automatic shotgun chambered in 12 GA. It has a 20-inch barrel, a 3-inch chamber, and a 5-round capacity in a black finish. 
 

Key Specifications 

• Brand: Century Arms 
• Model: Centurion A4 
• Caliber: 12 GA 
• Action: Semi Auto 
• Capacity: 5+1 rounds 
• Barrel Length: 20 inches 
• Color/Finish: Black 
   

Detailed Features 

• Piston-driven semi-automatic operation 
• 20-inch barrel with 3-inch chamber 
• 5+1 round capacity 
• Black finish

Owners of the Centurion A4 in black tend to call out the piston-driven action as a practical advantage. It runs cleaner than direct impingement alternatives, and most report consistent cycling across a variety of 12 GA loads after a short break-in. Some users mention the action is stiff out of the box but loosens with use.

The 20-inch barrel length suits general-purpose use without being unwieldy. The 3-inch chamber gives flexibility with load selection. Handling feedback is mostly positive, though the ergonomics draw occasional criticism compared to more purpose-built designs.

Value-wise, the Centurion A4 lands in a competitive segment. Owners generally find the build quality acceptable for the price, but a few note that Century Arms quality control can be inconsistent, with rare examples arriving with finish or fit issues that require attention before first use.