The P229 in .357 SIG combines the compact double-stack frame with the high-velocity bottlenecked cartridge developed jointly by SIG and Federal. The Secret Service carried .357 SIG P229s before transitioning to 9mm — the cartridge was chosen for its barrier penetration and consistent feeding in adverse conditions. Convertible to .40 S&W with a barrel swap, sharing the same magazines. Type: Pistol Action: DA/SA Caliber: .357 SIG Capacity: 12 Year introduced: 1994, USA Weight: 32.4 oz Overall length: 7.1" Status: Active Intended use: duty, law_enforcement