The Bersa Thunder Pro is a duty-oriented variant of the Thunder .40 with improved ergonomics, a Picatinny rail, and a streamlined slide profile. It targets law enforcement markets where the Thunder 40 was already in service, offering a modernized option without retraining. Type: Semi-Auto Pistol Action: DA/SA Caliber: .40 S&W Capacity: 13 Year introduced: 2007, Argentina Weight: 32 oz Overall length: 7.35" Status: Active Intended use: Duty, Law Enforcement