I have a Kimber 45 ultra carry that issues with the slide closing all the way when chambering a round. It will close fully when there is not a round in the chamber but lacks about 1/8 of an inch there is a round in the chamber. I just bought this gun from a pawn store and not sure of the background of the gun. I am thinking the previous owner may have disassembled the gun and it may not be put together correctly. Any thoughts on what it could be?