The OA Defense 2311 Pro is a semi-automatic pistol chambered in 9mm with a 5-inch ported barrel. It holds 21 rounds and ships with 5 magazines, 4 optic plates, tritium sights, an extended magazine release, and a case. The all-black configuration is optics-ready out of the box. 
 

Key Specifications 

• Brand: OA Defense 
• Model: 2311 Pro 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 21 
• Barrel Length: 5 in 
• Color/Finish: Black 
   

Detailed Features 

• 5-inch ported barrel 
• Optics-ready with 4 optic plates included 
• Tritium sights standard 
• Extended magazine release 
• Includes 5 21-round magazines and a case

Owners of the OA Defense 2311 Pro highlight the completeness of the package as a primary selling point. Arriving with 5 magazines, 4 optic plates, and a case reduces the immediate add-on purchases common with other pistols at the price point. The 2311-pattern platform with 21-round 9mm magazines draws interest from competition and high-capacity shooters alike.

The ported barrel is a distinctive feature, and owners generally note reduced muzzle rise compared to unported configurations. Some users find the muzzle noise and blast in enclosed spaces to be a drawback, while range and competition shooters rarely cite it as a problem. The extended magazine release speeds reloads and receives positive marks.

OA Defense is a newer entrant in the market, and long-term durability data is more limited compared to established platforms. Early owner feedback on fit and finish tends to be positive, and the 2311 Pro's value relative to comparable double-stack 9mm pistols is a recurring discussion point. Trigger quality is generally rated above average for the segment.