I carry one of three compact 1911's during the winter months. A 1966 Colt Commander (4 1/2"), a Springfield LW Champion (4") or a Springfield Compact Comp (4 1/4"). Any of the three do the job and are lighter weight than a full 5" model. That said, there are some disadvantages. A bit more recoil for one, though not much. Shorter sighting plane (no biggie), and the big bug-a-boo for short 1911's...reliability. The gun was originally intended as a 5" and the mechanics to make it work at shorter lengths sometimes don't pan out. Personally, I wouldn't carry anything under a 4" and then I'd have to be damn sure it ran with my intended load, EVERY TIME!
Colt still makes the Commander in a lightweight frame, that would be my first choice.
Colt still makes the Commander in a lightweight frame, that would be my first choice.