The OA Defense OA-2311 Full Size Pro is a 9mm Luger semi-automatic pistol built on a 2011-style, full-size double-stack platform. It has a 5-inch ported barrel with a DLC coating, a stainless steel slide, and an aluminum frame and grip module finished in black. The pistol ships with one 21-round and two 17-round magazines. 
 

Key Specifications 

• Brand: OA Defense 
• Model: 2311 Pro Full Size 
• Caliber: 9mm Luger 
• Action: Semi Auto, single action 
• Capacity: 21+1 
• Barrel Length: 5 inches 
• Finish: Black 
• Slide Material: Stainless Steel 
• Frame Material: Aluminum 
   

Detailed Features 

• Barrel is ported and DLC-treated to help manage recoil and promote consistent cycling 
• Slide is optics-ready and paired with ambidextrous controls and an enhanced trigger 
• Extended magazine release paddle speeds up reloads 
• Modular grip module uses a 7035 aluminum magwell 
• Includes one 21-round and two 17-round 9mm magazines

The 2011-style double-stack platform that the 2311 Pro builds on draws praise from owners for its 1911-derived single-action trigger paired with higher magazine capacity than a traditional single-stack. Reviewers who move from a narrower-grip 1911 usually comment on how quickly they adjust to the wider frame. Some early adopters of newer 2011 pattern makers wait to see how the design holds up over a long round count before fully trusting it for duty use.

In hand, the full-size grip and 5-inch barrel give a longer sight radius that owners say helps with follow-up shots, and the ported barrel is noted for cutting felt recoil, though a few shooters mention the extra muzzle blast and flash it produces. The ambidextrous controls and extended magazine release get called out as thoughtful touches for both left- and right-handed shooters.

On value, 2011-style pistols in this class are often compared to established competition and duty guns, and owners weigh the aluminum grip module's lighter carry weight against the higher price these builds typically command. The optics-ready slide is seen as a needed feature at this price point rather than an extra.