Well, I picked a Rossi Youth Matched Pair set in .22/20Ga at the Black Friday sale at Dick's for $89 after rebate. After giving it to my son for Christmas and cleaning the grease off of it with him, I thought it might be neat to add a .410 barrel and/or a .17 HMR barrel to this set and expand its capabilities a bit. Does anyone know if these barrels are interchangeable with no "matching" necessary? I've checked the Rossi web site and googled to no avail. I've even resorted to reading the manual. Thanks!