The Ruger LCRX is the evolution of the revolver. Its monolithic frame is made from aerospace-grade" 7000 series aluminum in .22 LR" .22 Magnum and .38 Spl +P models and from 400 series stainless steel in the powerful .357 Magnum" 9mm Luger and .327 Federal Magnum models. The patented friction reducing cam is a next generation design in fire control systems that results in a smooth" non-stacking trigger pull and the patented polymer fire control housing holds all the fire control components in their proper dimensional relationships" reduces weight significantly and helps reduce recoil. The high-strength stainless steel cylinder is extensively fluted (reducing weight) and features a PVD finish for excellent durability. These models have an external hammer for single action use.