My buddy has a special purpose turkey gun in 3.5 inch and he just got a run of the mill 870 cantilever barrel from remington. It works just fine, you just can't shoot 3.5 inch shells out of it.

This quote is right from remingtons web site when you go the barrel selector page.

"NOTE: Model 870 Extra Barrels with 3" chambers will fit Super Magnum, Magnum, and 2-3/4" receivers. These barrels will handle both 2-3/4" and 3" shells when used on Magnum receivers. Use only 2-3/4" shells when these barrels are used on 2-3/4" receivers."


Paul