The M&P357 is the .357 SIG variant of the original first-generation M&P platform, chambered in the bottlenecked .357 SIG cartridge favored by some law enforcement agencies for its velocity and terminal performance from a pistol-caliber round. The .357 SIG essentially drives a .355-diameter bullet at .357 Magnum velocities from a semi-automatic. Discontinued as the caliber lost agency support. Type: Pistol Action: Semi-Automatic Caliber: .357 SIG Capacity: 15 Year introduced: 2006, USA Weight: 25 oz Overall length: 7.6" Status: Discontinued Intended use: Law Enforcement