I sent my Mil Spec to SA Custom Shop, twice, actually. Some of the work done the first time didn't work out for me - I got hammer bite from the wide spur hammer I had them install, and the combination of the Heinie front sight and Yost-Bonitz retro rear sight had me shooting low. Second visit, SA didn't want to bob my wide spur hammer further than it already was, and couldn't correct my low POI, because the sight on my pistol was already the lowest one offered by Heinie. To satisfy these two points, I asked them install a beavertail grip safety, a Commander type hammer, and a Heinie Slant Pro rear sight (I specified the one for the Novak dovetail cut).
Now, here's a quick rundown of what has been done:
Ed Brown weld-on magwell,
Ed Brown Hardcore slide stop,
Ed Brown tactical thumb safety,
Smith & Alexander beavertail grip safety,
4# trigger job using Ed Brown Hardcore hammer, sear, and disconnector, with Greider medium-length match trigger
Heine serrated ramp front sight, with tritium insert,
Heine Slant Pro rear sight, black, for Novak cut,
Whole pistol mildly dehorned, parkerized (black manganese recipe)
In the photo, the pistol is wearing VZ Gator Back grips, but it now wears the black ebony double diamond grips Scott Sensing made for me when I first bought the pistol.
The work has all been executed beautifully, and they've even handled a bunch of aesthetic details, which I didn't request, and for which they didn't charge me. The only thing I can't report is whether the new rear sight will have the pistol striking POA for me, but a range trip shall soon prove that, one way or the other. As for the time to complete work on a pistol, I imagine that is highly influenced by the Professional production schedule, as well as any out-of-house finishing you might specify. I'd say just add about 4 weeks to their estimate, as that has been my experience. But no matter how long or short the interval, it will
seem too long for you.