Virtually every Uberti Colt replica comes with an arbor that is too short. You can check yours; if you insert the wedge in all the way it and it bottoms out against the side of the frame, or if the wedge goes in only part way and then the barrel begins to rub on the front of the cylinder, your gun's arbor is too short.

The good news is that this condition is easy enough to fix, and other than that, the Uberti's are the best replicas out there. Your gun will work as-is, but it will work much better if you fix the arbor. After a lot of use, all Colt style guns will loosen and will need an adjustment of the arbor.

BTW, another common problem is the front sight is usually too short, but that is easy enough to fix also (pull it out and make a new, taller one).

Here is how to adjust the arbor:

http://www.theopenrange.net/articles...ers_Part_3.pdf

http://www.theopenrange.net/articles...ers_Part_4.pdf