Brownells Front Cut RMR Slides for GlockA(R) pistols feature a distinctive, wraparound serration pattern that aids in manipulating the slide, especially when checking the chamber. They also come with a pre-cut slot for easy, secure, low-profile mounting of a Trijicon RMR sight. In addition, you can get your Front Cut RMR Slide with a "window" cutout on top between the front serrations that reduces weight and enhances airflow to keep the barrel cooler. Fits Gen3 Glock 17 and 19 pistols & components Machined from corrosion-resistant 17-4 stainless steel billet Heat treated to add surface hardness & given a wear-resistant matte black Nitride finish Mfg: Brownells