The main upgrade I would make is the grips. I ordered my Black/Walnut grips from Marschal and am eagerly awaiting their delivery. I'm expecting them to provide a much better grip and feel, as well as look, then the somewhat slippery and hollow factory grips. The thumb safety might use some polishing to be smoother, but I don't carry cocked and locked so that isn't an issue for me. The trigger on my recent production civilian model CZ-83 is as smooth as butter, and I really don't want or need it to be any better at this time. The factory sights don't bother me, as I've owned and shot handguns with worse sights then this.