ZEV Duty Slide Kits come with all ZEV internals fully assembled and topped off with preinstalled ZEV tritium night sights. The black nitride finish of the Duty slide provides a durable coating. And the patented ZEV RMR cut enables the use of red dot sights using an RMR installation footprint. The Duty slides feature the same workmanship and quality that ZEV is known for with a functionally driven design and utilitarian coating for the no-nonsense shooter who is looking to complete a new frame build or to enhance the functionality of their Glock. FeaturesMachined from 17-4 Stainless steel billetLowered ejection port to aid in ejection of brassMatch grade, precision milled tolerances that are tighter than factoryImproved accuracy and grouping performance upon installation DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.