That Walker snubbie is featured in a thread on The High Road titled Walker Avenging Angel, or something like that. He has a video of himself shooting it, the fireballs are awesome. And apparently this isn't an uncommon thing to do to C&B pistols, there's photos in the thread of others done that way. A photo of three display boards covered with them, in fact, and they're not Italian replicas either, but originals.
I have my Uberti Walker, which is gorgeous and gonna stay that way. I also have two Pietta 1851 Navies, one I bought new and the other is a beater I got for $100. Kinda eyeballin' the beater and rubbin' my chin a little......