That'd be extremely helpful in the upcoming zombie apocalypse! Too bad nobody has made it yet, or probably won't make it.
i210.photobucket.com/albums/bb135/Keep_015/guns-img-rdy2.gif Here is a little animation on how that transform-o-pistol supposed to actually transform. Just in case someone interested (and/or have a poor imagination =P)
Portable chainsaw=epic in its purest form.
I might also suggest to color the borders of those, they'd look better!
I like the use of a dim red. Very nice.