Shadow Systems MR920 Elite FDE Optics-Ready 9mm Semi-automatic Pistol with Holosun 507c Optic The MR920 is custom-built from the ground up to be the ultimate multi-role lightweight Pistol. It uses the Gen4 Glock 19 as the template, and is compatible with all existing G19 holsters, mags and accessories-but it's loaded with custom components, front to back. The MR920 is built around Shadow Systems' own Multi-Role Frame, designed to provide dramatically reduced recoil and muzzle flip. The frame makes use of new manufacturing techniques to wrap more texture around the curves of the grip-so it sticks to your hand for enhanced control. The slide is machined from premium 17-4 stainless steel, and features Shadow Systems's awesome new optics mounting technology (more on that below). A specially engineered window cut reduces weight and reciprocating mass for optimal recoil impulse, while front and rear slide serrations give you effortless control. The barrel is machined from 416R stainless steel, and features conventional rifling-so it's compatible with lead bullets. The spiral fluting pattern improves evacuation of debris and reduces barrel weight, making the MR920 9mm ultra-lightweight. This model comes complete with the Holosun 507c Red Dot Optic, so it's ready to go right out of the box. More on the Holosun 507c Designed specifically for use on pistols, the 507c combines clear glass, multiple reticle options and an open frame for a clear sight picture. It features a parallax-free sight picture and new LED technology to squeeze up to 50,000 hours of life from a single battery. Even better, Solar Failsafe keeps your optic operating off of available ambient light, so battery failure is not an option. Innovative Shake Awake technology brings the optic to life with the slightest movement, and once inchawake, inch the HS507C provides your choice of 2 MOA Red Dot, 32 MOA Circle, or both at the same time. Durable