Thank you for educating me. Even though I thought it might be a barrel off another rifle, it is in very good shape and as I see it, changing barrels on the HW90 and RX-2's is not a big deal. I have 3 barrels for my HW90 (.177-.22 and.25). It has the .22 on now and I've never changed it, but I can! The thought with the extra barrel's was so I didn't need to buy another rifle to shoot multiple calibers. Well, blew that!