The Magpul might not, but there are/were stocks made that do in fact interchange. They had a molded in "tube" inside that covered the action tube in the autos. Included was a long screw for use with the 870 or a shorter one for the autoloaders. Might have been Speedfeed that did that. Cant say for sure about the Magpul...mine isn't here yet. I wouldn't say for sure, not having the actual stock in my hand...just because one is pump and one is auto with an action tube sticking out the back. It also dont mean that it cant be done just because it might not jump out of the box and put itself on...I have seen hillbillies do harder things!!!! Common sense says no though...I think if it did both they would want to sell that many more and tell everyone it works for all.