Nikon Rifle Scope 3-9x 50mm Prostaff P3 Matte BDC The all-new PROSTAFF P3 riflescope series was designed to deliver Nikon’s legendary optical performance and mechanical consistency over a lifetime of tough hunting use. Built on an all-new aluminum one-inch tube platform for enhanced durability and modern looks PROSTAFF P3 models feature a one-inch main body tube and a 3x zoom ratio. The versatile magnification range results in an ideal balance of compact size wide field of view at the low end and increased detail at the high end.