AOG has great tweak info, and articles, but only "tweaks" I would recommend, is trying to get a good combo w/ a good low dwell w/ the paint+barrel match=efficient+sound reduction for those quiet kills. also give my way of cleaning ur gun a try (qtip msg above), pretty much only thing u need. Mite want to play around with your trigger if u want, consult info and articles if ur new to this. Last tweak i can suggest is if it works now, dont mess w/ the internals or mods.
2k Dark Green LCD #659