I'm shooting 3.5" at ducks and geese out of an 870 and the recoil really isnt that bad to me anyway. I have the remington R3 recoil pad on there, and it came with the gun.
I just bought a Mossy 935 this season and have had no trouble with recoil at all....even with the 3.5" loads.The kick is no worse than shooting a 3" out of a pump gun.