They do USPCA matches I believe.
I want to a nice trigger, a match barrel and an RMR. What was the company you posted last time that does the cutouts? I want to check them out again. I have to decide what RMR I am buying first though right?
Go with either a RM06 or RM07.
And I am getting my barrel/slide work done by Mod-K Armory (I hear great things along with the ones below)
But primary machine, jagerwerks, and battle werks are top notch (there are so many others as well)
Trigger check out Overwatch, they have a few to look at, I also love my agency arms, and I did finger fuck my buddies apex which was nice but I think they are ugly but that's meh.
As for buying an RMR first, that would help with a more precise cut but not needed at all, you can get the RMR cut first, (also look for good back up sights) and have a cover plate that fills in the milled spot until you want to add the RMR see below picture