I have the following for sale. I also have pictures available.
Advanced Technology 12G Pistol Grip (rear buttstock replacement, not front forearm).
I cannt 100% verify that all the parts are included. However I have 7 pieces included, which are the rear molded pistol grip, grip mounting bolt, 1 washer, 2 spacers, and two mounting adapters.
The on the manual lists this will fit the Moss 500, Rem 870, Win 1200/1300.
PLEASE make sure this is legal to mount and use in your area!
I will sell it for $35.00 shipped.
Please no IM Messages. Email myself for faster response.