What work/customizations/improvement have you had done to your carry weapons?

I'm curious what custom work/improvement people have had done to their carry weapons? For me, I have an HK p2000sk that I sent to GrayGuns for their carry package, and will soon likely send for DLC coating (lots of holster wear, and mags require daily cleaning because of humidity/rust on wear points). via /r/CCW http://ift.tt/2yva5Oh