Duty Gun Reliability with Race Gun DNA. The OA Defense 2311 represents a carefully engineered blend of performance and versatility; designed to deliver blistering speed and accuracy while standing up to the rigors of law enforcement and combat applications.FeaturesOptics Ready; Includes 3 Adapter Plates (RMR, Delta Point Pro, and RMSc)Night Fision Tritium Night Sights(3) 17 Round MagazinesCase IncludedSig Sauer P320 Magazine CompatibleFully Ambidextrous Controls