Maple Leaf is good too….. they will cut, cerakote, and even mount optic if you purchase it from them. Only like 125.00 for cut. Not sure of cerakote cost.
Primary Machine won't be milling customer slides until Black Friday. They cut back on customer supplied work to focus on in house parts when they made the move to the new shop.
However, Primary Machine is my go to. I've heard mixed reviews about Jaegerwerks. ATEi is the only other option I would trust, other than Primary Machine.
Anyone who mills the slide should have it recoated. Some offer cerakote services and may also offer nitride. I had my slide milled by Primary Machine and nitride finished. Total costs is between $200-300 for most services.