OA Defense builds the 2311 Compact Pro as a single-action 9mm pistol on a 2011-style platform, pairing a 4.25-inch barrel with a 15-round magazine capacity. It combines a stainless steel slide with an aluminum frame in an all-black finish, and its optic-ready slide carries front and rear cocking serrations. Ambidextrous thumb safeties and black grip panels complete the compact double-stack platform. 
 

Key Specifications 

• Brand: OA Defense 
• Model: 2311 Compact Pro 
• Caliber: 9mm 
• Action: Single Action 
• Capacity: 15+1 
• Barrel Length: 4.25 in 
• Finish: Black 
• Frame Material: Aluminum 
• Slide Material: Stainless Steel 
   

Detailed Features 

• Optic-ready slide has front and rear serrations 
• Stainless steel slide is paired with an aluminum frame 
• Ambidextrous thumb safeties suit single-action carry 
• Dual-stack 15-round magazine capacity 
• 2011-style grip and controls sized for a compact platform

Owners of the OA Defense 2311 Compact Pro generally like the fit between the aluminum frame and stainless slide, describing the action as smooth once broken in. As with many 2011-style pistols, a few users mention a proper break-in period before the slide runs consistently.

The compact grip and single-action trigger are popular for quick follow-up shots, and the ambidextrous thumb safeties suit both left- and right-handed shooters. Some owners find the double-stack grip a bit thick for smaller hands compared to slimmer single-stack pistols.

As a 2011-style pistol, the 2311 Compact Pro benefits from a growing aftermarket of grips, sights, and holsters shared across the platform, and most owners consider it a reasonable value entry into the 2011 category.