I need some advice/information from my 1911 friends. I recently had some minor changes made to a SA GI Micro Carry 45 (sights, grips, hammer, beavertail safety and slight honing). It is now complete to my satisfaction ,except for the black barrel that is already scratched from use. I want to put a stainless, match grade barrel in - purely for cosmetic reasons. Question - is that a drop-in task, or does it require a smith to fit it ? I realize that with such a short barrel , I probably wouldn't notice any difference in accuracy, but that is not the reason for the change. What brand do you recommend ? Tks..