Sig Sauer P320 Slide Catch Lever, Manganese Phosphate. Constructed from quality steel with a manganese phosphate finish, this OEM factory standard slide catch lever is for the Sig Sauer P320 pistol systems chambered in 9mm, .40 S&W, .45 ACP, and .357 SIG. This component functions by catching/keeping the slide in place, allowing for cleaning and inspection of the chamber. This piece works great as an immediate replacement, spare, or for the next workshop project.