OA Defense 2311 Compact Pro 9mm, 4 in., SAO, Optics-Ready, Night Fision Sights, 17+1, 5 Mags, 4 Plates, Case
The OA Defense 2311 Compact Pro is a compact, 4-inch, single-action 9mm built with a steel slide over a 7075-T6 aluminum frame and a removable polymer grip module. It is designed to use SIG P320-pattern magazines and comes with five 17-round magazines. The slide is optics-ready via a modular plate system, and Night Fision tritium sights are installed from the factory. Fully ambidextrous controls, a flared magwell, and a MIL-STD-1913 accessory rail complete a high-capacity 1911-platform package made in the United States.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are visible signs of wear on the grips, along with scratching and rub marks on the frame, magwell, and barrel.
What’s Included
- Five 17-round steel double-stack magazines
- OA Defense-branded soft zip case
- OA Defense 2311 manual
- Four OA 2311 optic plates: RMR; RMSc/HSK (x2); RMP
This Compact Pro variant features a 4-inch, bushing-less, linkless Browning-type operating system with a full-length guide rod for smooth cycling. The frame is 7075-T6 aluminum topped by a steel slide, and the removable polymer grip module carries the OA logo.
Ergonomics and controls are fully ambidextrous, with thumb safeties and slide stop levers on both sides. The grip module includes gas-pedal/thumb-rest ledges and texturing for secure handling. A flat-faced, lightened trigger and a skeletonized hammer are factory components.
The slide is cut for optics plates and includes aggressive serrations and lightening ports. Sights are Night Fision tritium units, with an orange-ring tritium front and a tritium rear for low-light visibility.
A large flared magwell is installed for fast reloads, and the dust cover carries a MIL-STD-1913 three-slot accessory rail. The pistol is designed to use SIG P320-pattern magazines, providing a 17+1 capacity in a compact footprint. Additional details include debris-clearance channels, magazines with witness holes numbered to 17, and markings noting "OA DEFENSE DAYTON, NV."