The OA Defense OA-2311 Full Size Pro Elite S is a 9mm Luger semi-automatic, single-action pistol with a 5-inch barrel and a black aluminum frame. It is a modern double-stack 1911-style handgun with an optics-ready slide, an ambidextrous manual safety, and an accessory rail on the dust cover. The pistol comes with both 17-round and 21-round magazines. 
 

Key Specifications 

• Brand: OA Defense 
• Model: 2311 Pro Elite S Full Size 
• Caliber: 9mm Luger 
• Action: Single Action 
• Capacity: 21+1 
• Barrel Length: 5 inches 
• Finish: Black 
• Frame Material: Aluminum 
   

Detailed Features 

• Optics-ready slide is paired with an ambidextrous manual safety 
• Accessory rail is machined into the dust cover for lights or lasers 
• Fiber optic front sight is fitted with a fixed rear sight 
• Ships with both 17-round and 21-round double-stack magazines 
• Full-size 1911-style frame built for double-stack magazine capacity

As a double-stack 1911-style pistol, the 2311 Pro Elite S draws the same comments longtime 1911 shooters make about the platform: a crisp single-action trigger and a low-slung grip angle that points naturally. Owners moving up from a single-stack 1911 usually mention the wider grip takes some adjustment, and the manual safety's ambidextrous levers get called out as a welcome update for left-handed shooters.

In use, the full-size aluminum frame and 5-inch barrel give a long sight radius that owners find helps with precision, and the fiber optic front sight is easy to pick up quickly. The accessory rail and optics-ready slide are seen as practical additions for a duty or home-defense role rather than pure competition use, though a few owners note the metal frame adds noticeable weight versus polymer-framed alternatives.

On value, double-stack 1911-style pistols in this class tend to cost more than standard single-stack 1911s because of the extra machining involved, and owners weigh that against the added capacity from the 17 and 21-round magazines. Aftermarket support for 1911-pattern parts is broad, which owners count as an advantage even on a newer double-stack design.