Am I mistaken or wasn't the Katana a Disco with a different stock?
Original owner's manual attached thanks to Kim (Lil' Sis) of Crosman.Tyler (Tpatner412) furnished this link to the spec page from Pyramyd Air. The Katana was a Pyramyd Air exclusive, made just for them.https://www.pyramydair.com/product/benjamin-katana?m=2012#Specifications
I see that Dave beat me to it by posting the manual which also describes the barrel. Interesting that neither the manual or parts list is on the Crosman website. Even if out of production they usually have it posted. I think most of the parts based on the 2260 (Discovery, Challenger, etc) can be mixed as Crosman likes to use the same parts on multiple models. Not an expert, just a person with enough knowledge to be dangerous to myself and those around me.Dave