The SIG P220 was developed for the Swiss Army as a replacement for the SIG P210, which had been developed during World War II; in service it is known as "pistol Model 75". For development of the P220, SIG collaborated with J.P. Sauer of Germany, thus, the P220 and all subsequent pistols from SIG are properly known as SIG-Sauer pistols. The P220 operates by the locked breech short-recoil method pioneered by John Browning.
The SIG-Sauer P220 is short-recoil operated, locked-breech pistol. The locking is of modified Browning type, where the barrel engages the slide with single large lug entering the ejection window. The unlocking is controlled by a cam-shaped lug under the barrel, which interacts with the steel insert set into the aluminium frame. The slide is made from sheet steel by stamping and forming processes, with the separate breechblock pinned into the rear of the slide (machined slides are available on some current production .45 caliber models). The standard trigger is the double-action type, with an automatic firing pin block safety and a frame-mounted decocking lever.
Specifications: Calibre: .45 Auto
Magazine capacity, rounds: 10
Barrel length: 112mm
Overall dimensions: 198x140x36mm
Weight, unloaded: 1,1 kg (with empty magazine)
Trigger mechanism: SA
Other calibre: 9x19mm
Source: Wikipedia
