Hi, guys... I fitted this together myself, from a SA Loaded model, and it came out great.... Trigger pull is a crisp 5#, with the Harrison hammer and ignition. Wilson match trigger, Ed Brown and EGW smaller parts, and a KC Kustom ambi-safety. Functions great, and runs great, with zero issues so far. But I've never fit a match barrel, and the groups aren't too spectacular with the factory barrel and bushing. Do I need a barrel, or just a bushing, and if so, which ones ? A link would be helpful lol. What measurements do I have to take, bearing in mind that I have ZERO machining skills. Which barrel would be the best, and easiest for a novice to fit ? Am I jumping in too deep, with both feet ? Thanks in advance !!