I have an 870 thumbhole I modified and had on my sp-10 the last couple years.You see in the pic it leaves an 1/8" gap that I filled with a simple silicone bead.I'd trade it for a nice box call or knife.It works fine and sure beats the $200 one they sell!
(http://img.photobucket.com/albums/v82/4nolz/photobucket-6411-1327523340551.jpg)
just the stock-not the butt plate or swivel (you just use yours thats what I did and put my original stock back on tonight)
(http://img.photobucket.com/albums/v82/4nolz/photobucket-1668-1327523383731.jpg)
Somewhere here onsite is an old how-to.A standard 870 stock wont fit you have to drill out the stock a tidbit with an extended wing bit.
From the inside it looks like actionwood plain laminated then camo'd.Came that way from remington i couldnt find a camo match.
Trade?
(http://i1137.photobucket.com/albums/n509/Gamblinman/RealHen.jpg)
Gman
looking for a custom box call (not uber expensive one) rather than a mass produced.Or knife.