The SW99 rendition of the popular Walther P99 was the product of a joint collaboration between Smith & Wesson and Walther. The modified receiver used in the SW99 is supplied by Walther and is manufactured in Germany. Smith & Wesson manufactures the slide and barrel of the SW99 in the United States. Though there are slight variations in aesthetic design, the function of the SW99 is identical to its German-made counterpart.

The Walther P99 is a semi-automatic pistol developed by the German company Carl Walther GmbH Sportwaffen of Ulm for law enforcement, security forces and the civilian shooting market as a replacement for the Walther P5 and the P88. The P99 and its variants are also made under licence by Fabryka Broni Radom.