Nice looking shotgun with the muzzle attachment. Its a bitch shooting a pistol grip only 12g so good call on adding a proper shoulder stock. I think you will be most happy with it. If you have it cerakoted what color(s) are you considering?
I love the patriot brown cerakote color. I've often thought if I were to ever have one of my guns done in cerakote that will be the one I choose.
http://www.texaselitetactical.com/mossb ... pe-finish/
This link might provide some inspiration
Speaking of upgrading shotguns really thinking of purchasing the FAB DEFENSE railed forend for my 20 inch 500. Then I can mount a flashlight and use an AFG as well. That gun is my 24/7 365 home defender. On my 18.5 inch 500 I want to eventually pickup another barrel (choke threaded) and some old school wood furniture. I'd like to convert it more into a proper hunting gun but have the 18.5 barrel handy to use in a pinch if things get dicey here at the homestead and had to utilize for that role.