The OA Defense 2311 Compact Pro Plus is a compact pistol chambered in 9mm Luger, built on an aluminum frame with a 4.25-inch ported barrel. It carries an optics-ready, serrated slide in Black DLC steel over black polymer grips, with fully ambidextrous controls. The Plus Kit configuration runs a 17+1 capacity. 
 

Key Specifications 

• Brand: OA Defense 
• Model: 2311 Compact Pro Plus 
• Caliber: 9mm Luger 
• Capacity: 17+1 
• Barrel Length: 4.25 inches, ported 
• Frame: Aluminum, black, compact size 
• Slide: Steel, Black DLC, optics-ready and serrated 
• Sights: Fiber optic front, fixed rear 
• Dimensions: 5.10 in height, 1.40 in width, 7.75 in overall length 
   

Detailed Features 

• The 4.25-inch barrel is ported and finished in Black DLC to help control muzzle rise. 
• Fiber optic front and fixed rear sights come standard on the optics-ready slide. 
• Fully ambidextrous controls and safety suit both left- and right-handed shooters. 
• Black polymer grips sit over the aluminum frame for a light, compact package. 
• Trigger pull weight is set between 3.5 and 4 pounds from the factory.

The Plus Kit version of the 2311 Compact Pro appeals to owners who want the compact footprint but do not want to give up capacity, and the 17+1 count is usually the first thing mentioned in reviews of this configuration. Fit and finish on the Black DLC slide and aluminum frame draws consistent praise, and the factory trigger pull is generally described as light and crisp for a compact double-stack.

Carrying and shooting the pistol day to day, owners like that the fiber optic front sight picks up fast in a defensive drill, and the ambidextrous controls work equally well for left-handed shooters, which is not always a given on a compact 9mm. The tradeoff some owners point to is that a higher-capacity compact grip is a bit wider in the hand than the standard Compact Pro, so shooters with smaller hands sometimes prefer the lower-capacity version instead.

On cost and support, the Plus Kit sits at a premium over the standard Compact Pro because of the extra capacity and the included kit parts, and buyers generally see that as a fair trade if they were going to buy the upgrade separately anyway. Magazines and holsters sized for the compact 2311 frame are less widely stocked than for full-size single-stack pistols, so some owners plan ahead when sourcing spares.