You know, the only risks I can think of when using a cleaning rod on any barrel is the propensity to flex and cause abrasions to the rifiling and especially to the crown when not used carefully. On barrels that have visible tooling marks that could benefit from a bore lapping/polishing I don't see how you can get around not using a rod.A lot of Gamo barrels used to routinely have obvious tooling marks that necessitated aggressive cleaning to remove the build up in those machine imperfections. I pretty much just use the pull through method(I like the Hoppe's Bore Snake) for those now rare occasions when I clean an air rifle barrel.