The GARD 22 Caliber 6 Shot Revolver Gun Knife 

THIS MILITARY KNIFE PACKS A .22- CALIBER PISTOL IN THE HANDLE
A badass revolver/bayonet hybrid fit for James Bond himself.
An old adage warns that you should never bring a knife to a gun fight...unless you're packing this killer pistol/knife hybrid. The Global Research And Development (G.A.R.D.) MB16F is a beastly 6.5-inch bayonet with a .22-caliber, six-shot revolver hidden in its handle. The wild-looking weapon, which had a very limited production run in Las Vegas throughout the early 2000s, works much like any other handgun. Squeeze the low-profile trigger, and a .22 Long Rifle round fires through a 3.5-inch barrel located above the flat edge of the blade.
If you really want to go overkill in the firepower department, this thing can be attached to any M16/AR15 platform with a military-spec, 21.5-inch barrel.
The Gard. MB16F is expected to fetch between $1,500-$2,000 through