This is going to be my birthday present to myself next year. It will be my first 1911. Just a few questions about these particular types of 1911's. Do they have looser tolerances than other 1911's? Any problems shooting modern jhp ammo through them? Can they be fitted with night sights? The three models I am considering are the SA milspec, a Colt govt model of some kind, and the Auto-Ordnance 1911A1. Any thoughts on any of the aforementioned models? Thank you for your input.