Primary Arms GLx RS-15 Mini Reflex Sight, 26X20MM, 3 MOA Center Dot with 250 MOA Outer Circle, ACSS Vulcan Reticle, Direct Mount to SIG P320, Includes GLOCK MOS Adapter Plate, Anodized Finish, Black GLX-RS-15TL-ACSS Bringing the quality of GLx optics to mini reflex sights, the RS-15 is the next-generation pistol optic packed with features. This mini reflex sight features a larger window, 7075 aluminum construction, and includes a GLOCK MOS mounting plate for out-of-the-box compatibility with a wide variety of pistol slides. Side-mounted brightness buttons make it easy to use, and the top-mounted battery compartment lets you quickly change batteries without removing your optic. This model comes with a Red Dot Bright ACSS Vulcan Dot reticle, which features a precise dot with an outer circle that extends beyond the visible lens. This outer circle provides a quick reference for your dot, helping you adjust and get your reticle on target.