I believe you'd need to make a new animation for any other handgun replicating the load characteristics of Colt 1911. I can't think of a way around at the moment. You may try changing the hud of any gun with that of Colt1911, but a possible ctd waits at the corner, unless files opened and a lot of relevant reconnections done.
-I can see the sequence on MAYA, but it's very (extremely) time consuming process to make some alterations, unless it's someone who can work on maya while he sleeps.

(edit: PS: I can see many file types on MAYA, have quite a few plug-ins.)