User blog comment:JackFrost23/RDR Cheater Exploits and "The Bubble Gun"/@comment-76.18.88.11-20110627051137/@comment-1265875-20110627154923

R* claims that the Bubble Gun cannot exist on the PSN because save files cannot be modded on a PS3.

So, fortunately, you may never have to deal with the Bubble Gun.