Gun-whip...

and don't forget about the Gun-Guitar...

http://images2.wikia.nocookie.net/__...3D-Ricardo.jpg
http://www.jedistar.com/images/guitar/gun_guitar.jpg

hmm...wonder if there are any more gun-instruments....

http://nashvillenightsblog.com/images/siriusmogun.jpg

O_o ...gun...keyboard...?