Where would be some places I could look to find the cause of a 1911 slide not locking into battery smoothly? It locks OK during limited test firing, but when I cycle the slide by hand it seems to hit a "bump" about half an inch from full closure and stops. I can palm the rear end to get it to go all the way, but I think this should be much smoother and it should lock even when hand cycling. It is something internal, nothing obvious externally, and no magazine is involved (also no cartridge - empty chamber).