Smith & Wesson agreement, Walther produced the frames, and Smith & Wesson produced the slide and barrel. The pistol has several cosmetic differences from the original Walther design and strongly resembles a hybrid between the P99 and the Sigma series. In 2005, Smith & Wesson debuted a new polymer-frame pistol intended for the law enforcement market. Dubbed the M&P (for Military and Police), its name was meant to evoke S&W's history as the firearm of choice for law enforcement agencies through its previous lineup of M&P revolvers. The M&P is a completely new design with no parts interchangeable with any other pistol including
Smith & Wesson Model 4506 Smith & Wesson Model 4516: Compact version with a 3 " barrel on a smaller frame accepting 7 round single column magazines. Smith & Wesson Model 4546: Double-action-only version of the 4506 with a rounded, stubby hammer. Only produced in 1992. Smith & Wesson Model 4563: Midsize version with a 4" barrel on a full-size alloy frame. Smith & Wesson Model 4566: Midsize version with a 4" barrel on a full-size steel frame, the 4566 was formerly the issued sidearm of the New Hampshire State Police. Current issue (June 2015) with West Virginia State Police, in DAO (Double-Action-Only; TSW version),