The slide is machined from a solid block of stainless steel and protected by SIG’s black Nitron® finish. Available in 9mm, and .40 S&W. It also features the SIG SAUER four-point safety system. The SIG SAUER polymer framed pistols has earned an enviable reputation and proven track record of reliable performance in the hands of law enforcement professionals. In December of 2004 the U.S. Army Tank-automotive and Armaments Command at the Rock Island Arsenal awarded SIG SAUER a contract for 5,000 SIG SAUER SP2022 pistols chambered in 9mm.