The WMP’s 4.25" carbon-steel bull barrel is secured to a steel locking block (arrow) that uses a polymer buffer to cushion it from the aluminum slide.

Walther WMP Specifications Importer: Walther Arms Action Type: hammer-fired, double-action, semi-automatic, rimfire pistol Chambering: .22 WMR Barrel: 4.5" stainless steel Slide: aluminum Frame: ...