The 14" barrel is not tapered, the 10" is slightly. The 14" forend will fit the 10" barrel, but the fit is sloppy. A 10" forend on a 14" barrel will split the wood when you crank down the screw. They're cheap enough, it's best to get the right one. Also the carbine forend is totally different from either of the other two; much more taper and the screw spacing is different from the 14". (10" only has one anyhow.)