The box stock one, all I've done is put a long steel trigger in it.
At the time I had the custom one built I think he was putting two differnent comps on them, A(1" long) and B(1&1/2" long) comps? On this gun, he shorten the slide by an inch ( to speed the time to eject and recharge the chamber) and he used a tapered barrel like what's on the officers guns, checkered the front strap, main spring housing, back of the slide, squared and checkered the front of trigger guard, lowered and beveled ejection port, put a enlarged mag release button and one of his springs in it, beveled mag. well, fitted slide to frame, milled for BoMar sights, hard chrome plated the frame, did a custom trigger job(actually breaks at 2&1/4#, and I have trouble picking up that weight and I've never had a hammer follow down), rounds all the edges and reblued the slide, mill the top of the slide flat and serrate. Probably, something else but, it's been about 20 years since I had the work done?