I just picked one up as well! Thanks for the tip!Lots of accesories for your Moss 500A. I did some research on Ebay, and contacted the companies. Barrels, stocks, add on stuff, optics. look under Mossberg Tactical.
Good luck!
I prefer the wood furniture alsoI just acquired a Mossy 500a also, it had some tacticool pistol grips, fore and aft, I traded them for wood stocks, I like them better!! Good luck with yours!! Before and after shots... OP,how do you go about mounting a ghost ring sight on a 500?