High Quality Content by WIKIPEDIA articles! The Ruger P series are a line of centerfire semi-automatic pistols made by Sturm, Ruger Company. The P series pistols were designed for military, police, civilian self defense and recreational use. The designs are largely based on the Browning action found in the M1911 pistol, but with minor variations, generally related to the safety mechanism and the barrel-camblock interface. Reviews have considered them rugged, reliable, and strong, though this strength comes at the price of bulk and a blocky appearance.