ORIGINAL: SuperMagnum

Any 870 barrels will fit on it. However, if you put on a barrel rated for up to 3" shells, you won't be able to shoot the 3" shells out of yours because your receiver is only rated for the 2 3/4" shells and you need a magnum receiver to shoot the 3" shells. But other than that, you will be able to shoot any 2 3/4" shells with the remchoke without any problem.