I've only done this 2x, both with Wilson parts. I just wanted to get beavertail grip safties put in for less than $125. I bought the drop-in parts and, guess what, they didn't drop in. Had to pay $25 to have a gunsmith fit them to the guns. Still I think all said and done I paid about $75 parts/shipping/labor and it was a good deal. Cost me $150 (part and installation) to have a beavertail put in on my Government model years ago. The frame had to be milled, but this guy did an awesome job, the best work I've ever seen.