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Hi Christopher and welcome. A Shadow Systems G19 slide utilizes a patented "multi-footprint" optic cut, meaning it is designed to fit a variety of optics with different footprints, including most popular RMR-style optics like the Trijicon RMR, Holosun 507c, and Leupold DeltaPoint Pro, without the need for additional adapters; essentially, it can accommodate multiple optic styles with a single cut on the slide. Cheers and stay safe!
It comes with the PATENTED MULTI-FOOTPRINT OPTIC: The Shadow Systems patented optic cut is the only in the industry to allow ultra-low mounting of most brands of red dot optics directly to the slide without the need for plates, adapters, or tiny screws.