This is a Gen 4 Glock 41 Complete Slide (OEM) that was custom milled by Boogeyman Customs. It is cerakoted in It is direct cut for an RMR/Holosun and has a Vector Optics Frenzy mounted (budget SRO) which is included. It will come with all OEM internals, barrel, etc. If you're looking for a good old optic ready 45acp and don't want to pay for another full gun/optic cut/milling - this is it. Will fit on an large caliber Gen 4 Glock frame.