hey guys, I'm looking to build/buy a g23 from semi ground up. thinking of buying used, and then replacing parts with better upgrades. any suggestions on specific parts ( slides, barrel, lights, suppressor, sights, etc ) i should check out. Things i should stay away from? plus, any sugggestions on (aiwb) appendix inside waistband ) holsters for us left handed shooters. thanks peeps, have a nice holiday.