Can't say I feel a lot of difference. Statically it feels less front heavy, more like Stock 2. When I shoot it, I don't notice much. It took me about 5 months to get this done.  Finding extra slide, then it went through 3 different shops (in retrospect, two could've done it), then I decided to mill the frame, then - fortunately before the work was done - my first Shadow 2 broke that internal piece and had to be replaced, etc. So for the last 5-6 months I've been shooting Glock 19x, and I just do