The DUSK19 upper includes a new DUSK19 profile slide made of 17-4SS and finished in either an attractive black nitride or a selection of great PVD options such as flat dark earth, oil rubbed bronze, or graphite gray. Front and rear serrations on the slide provide ease of chambering and press-check. The slide is reflex sight-ready with the DUSK19 optic cover plate included, which is compatible with both Trijicon RMR/SRO and Holosun 407/507/508 (Non-K Models) footprints. Additionally, this slide includes a ? co-witness or suppressor height Night Fision Stealth Series sight with a Tritium insert for clear sight vision from DUSK to dawn. The upper also includes a 416 stainless-steel PVD coate Mfg: Lone Wolf Dist.