Glad for the OP's happy experience.
I bought a secondhand G20 with a complete LW long slide and barrel, and had terrible reliability at first. I sent the barrel back to them and asked them to check it and ream it slightly if necessary. I noticed that the fit was exteremely tight, even when completely clean. Got it back in fairly quick order (without any paperwork stating if they had done anything), but they must have because it has been perfect for the first hundred rounds since. Granted, I'm sticking with Georgia Arms FMJ and Double Tap ammo, but everything is nice and smooth now. I'm super happy :D