I put an ATI collapsible(M4 Style) stock and 3 rail forend on my 870...I didn't like how it fit me when shooting....I ended up putting the Hogue stock and fore end with a shorter length of pull...love it....
By the way.....I have that ATI settup still, love to get rid of it...........
I just posted it in the classified section under gear and stuff.......don't wanna hijack this threadany pics? price? if it fit an 870, I think it should fit a Mossberg 500 as well. I happen to have a Mossy that still has the factory stock.....hmmmm