I would have suggested Robar but they got out of the custom gun business, never could figure or hear why, they were real good at a lot of stuff. I'm sure there are lots of places that could do it. Can't name any off the top of my head at the moment.
The slide stop is easy and you could do it yourself with a file sand paper and some cold blue. A pro finish would be more long lasting perhaps but the cold blue would work and easy to touch up.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."