I'm pretty sure you could take the gun apart. Take the shell with the sticker on it. Soak it in water, and peel
the sticker off.
Thanks for the suggestion Moonlight, but I can certainly vouch that in my experience this is not a good idea. This type of sticker (which are the same as the ones on the E-a-B ) are very much like paper. They may have had a coating at some point, but it's most likely long gone if there ever was. On the E-a-B, all the water was able to do (even when just simply trying to scrub them off after they were ruined) was to soften the paper itself.
I think our best hope would be some way to loosen the glue's hold, but I havent the foggiest on a good way to do this.
Sorry for the bad advice
I've had no past experience with the secret strike 1 at all.
I do know that method works with other stickers though so...