Shadow Systems slides are machined from Billet 17-4 Stainless Steel to more precise tolerances than factory slides. These slides are compatible with Gen 3 frames. All slides are coated in Black Nitride. The Shadow Systems Carry slide has front and rear cocking serrations for an improved grip. It also has proprietary inletting on the top and sides to help reduce weight. The Shadow Systems TOR slides (Threaded Optic Ready) are ready to accept the RMR red dot sighting system and have enhanced front and rear serrations for improved grip. It also has lightening cuts that help to increase slide speed and decrease lock time to assist in limiting muzzle rise between shots.