Guys I got a G17 in the other day that won't shoot. It has a 4 hole shcu compbarrel on it. The barrel is in a Caspian SS slide. The main issue seems to be a lack of slide travel upon firing. Does anybody have experiance with a simmilar set-up. I have tried lightening up the recoil spring,but its not helping. There is no dragging or hang-ups in its travel. it dissasembles correctly. All parts visually appear in spec. The fit of the comp to slide looks good. nothing tight,nothing to loose. Anybody?