If you've got a barrel of usual quality, the most you'll need is a bit of polishing on the barrel ramp & in the chamber. A crown job doesn't hurt either. I've "accurized" a bunch of these with excellent results. When done with slide tightening ( to increase barrel lock up), you would be amazed at the improvement. A word of caution. Slide tightening, in & of itself, does not inprove accuracy that much, if at all, & can reduce reliability if done wrong. The benefit comes from reducing play in the barrel at lock up.