PISTOL: AMERICAN TACTICAL - ATI MODEL OMNI HYBRID PISTOL, SERIAL NUMBER NS039488, SEMI - AUTOMATIC, 5.56 NATO, BLACK (MATTE), CASE NOT INCLUDED, 10.5 Notes: The American Tactical (ATI) OMNI Hybrid 5.56 is an AR-pattern firearm designed around ATI's metal-reinforced polymer OMNI Hybrid receiver system. Depending on the specific OMNI variant, configurations have included rifles and pistols, so the exact barrel length, overall length, stock/brace configuration, and magazine capacity should be verified from the markings on the individual firearm. The OMNI Hybrid system uses polymer receivers with metal reinforcement around critical areas, while maintaining compatibility with many standard AR-pattern components. Key points: Manufacturer: American Tactical (ATI) Model: OMNI Hybrid Caliber: 5.56 NATO / .223 Remington Operating system: AR-pattern, gas-operated, semi-automatic Receiver: Metal-reinforced polymer upper and lower Receiver features: Reinforced areas around the buffer tube and takedown-pin locations Upper: Flat-top configuration on many models, allowing optics to be mounted Lower: Beveled magazine well and enhanced trigger guard on many configurations Barrel: Varies by model; the OMNI Hybrid line was offered in multiple configurations Magazine: Common configurations use standard AR-15-style magazines; capacity varies by magazine Construction: Designed to reduce weight while retaining reinforced contact points Compatibility: Many models use Mil-Spec-compatible components Finish: Commonly black, although other configurations/finishes exist