Shortening the barrel below, say, 4", introduces all kinds of problems....
The slide velocity naturally tends to go up as the slide mass goes down. This requies that you use heavier recoil springs, or your reliability craps out. But you have less space to put the springs under the short barrel, so you have to use shorter ones (fewer coils), which wear out faster. In the meantime, heavier springs beat your gun up more than light ones, all else being equal, and make the gun more prone to limp-wristing. And you had better be using the strongest springs in your magazines that you can, and take a pass on the +1 1911 magazines. Use full power ammo or the thing won't cycle... etc., etc.
Some of the super-tiny 1911s work fine. Everything just has to be completely squared away on them. Otherwise, they are alot more prone to crapping out than a 5" or even 4" gun.