The DUSK19 upper is a pinnacle of precision engineering and aesthetic appeal. Features the innovative DUSK19 profile slide crafted from robust 17-4 stainless steel. Available in a sleek black nitride finish or a variety of premium PVD coatings, including flat dark earth, oil-rubbed bronze and graphite gray. Designed with functionality in mind, boasting front and rear serrations for effortless chambering and press-check operations. Reflex sight-ready, equipped with an optic cover plate compatible with Trijicon RMR/SRO and Holosun 407/507/508 (excluding K models) footprints. Fitted with a 1/3 co-witness or suppressor height Night Fision Stealth series sight, featuring a Tritium insert for clear and reliable sight vision from dusk till dawn. Ensures precision and confidence in every shot, whether in low-light conditions or bright daylight. Equipped for reflex sight compatibility, including a Dusk optic cover plate Front and rear serrations facilitate chambering and press checks