I was checking GunsAmerica for Pen Gun Pics & came across this knife with a 6 shot .22 revolver built into the handle.
It's $700~Smack~A~Roons....a fairly Steep Price for a novelty item but, this looks like a really high quality unit. I love the blade style.
It should be...for $700.00 I reckon.
By the way there is a .25 Caliber Pen Gun for sale on GunsAmerica for $180.00 in case you are really into Rap Music.