I've had 2 410s 0ver the years. One with hammers and one hammerless. The orginal chambers were for 2.5" shells, and I belive that that5 is the only chamber lenght they manufacture. Shotguns manufactured by Cresent under various names is very long. They would put anyones name on them that ordered enough. All SxSs I've handled have been guns with sideplates.