[Jeremy]

From Benelli yes, for the M4, M1014 and Super 90's. I haven't seen anything for the Nova's at all. I think the prob is you gotta work around the proprietary recoil stock system.

Rem 870 and Mos 500 have nothing in the stock so it's relatively easy to add folders to them.

The buffer isn't really a problem because it's removeable in older models. If it's an older gun you can find pistol girp stocks but i haven't seen any folders. Also on the newer models you'll notice that the stock and reciever are all one piece. So unless benelli makes it with a folder it can't be done.