At least one reputable knife company made one, as I recall.
You mean these ?
INSANE KNIFE GUN - When bringing a knife to a gun fight is ok.
05FEB
No one in their right mind would
bring a knife to a gunfight. On the other hand,
many gun owners have been known to pack a blade for those just in case moments. In the late 1990s, one company specialized in hybrid knife guns that packed an unseen punch. This punch, concealed in the grip of the knife, was a small revolver caliber round. That company was known as GRAD.
Handguns with knives or bayonets have popped up frequently throughout firearms history. Such examples as the
Elgin pistol, the
Apache revolver,
and others are well documented. These guns were just that: handguns that happened to have a knife or bayonet attached. Really, these weapons were guns that had a knife as a back-up weapon or tool, not the other way around.
GRAD fighting knife.
But, there is a similar evolutionary train of knives that have had guns attached to them. The main purpose of these devices was knife-first, gun-second. The user would have a strong, well-made knife for cutting, prying, or use as an edged weapon. The pistol came as an accessory attachment on the knife, reminiscent of Swiss Army knives that have many tools on them (only these knives had a gun instead of a pair of tweezers and a corkscrew).
Knife/gun combos have been more common than you may think. Back in the 1950s, Illinois-based U.S. Small Arms marketed and sold a folding pocketknife that held a single barreled .22LR along with its blade. In more recent times, the Powell and Brown Company of Tucson, Arizona marketed a long-bladed folding utility knife that concealed either a .22 or a .38 single-shot barrel.
The barrel’s muzzle was shrouded by the top half of the grip and fired over the top of the blade through the hilt of the knife. To load and clean the revolver, the grips separated and folded open, allowing access to the concealed gun.