I'd take just about anything for free, but if it was illegal, I'd have to assume it was a sting operation and turn it down.
If we're talking just plain ugly guns, there are a few tricked out movie guns that qualify, for example the "Man from Uncle" pistol that I understand started out as a p-38, or Han Solo's blaster.
If we're talking about ugly guns that really exist, they don't come much uglier than the Borchardt, but I'll take it, or just about anything else with a 5-figure price tag, for free. OK, there are uglier ones, like some of the so-called "Apache" pistols (named for the French gangsters, not the tribe). There's something not quite right about a revolver with brass knuckles and a bayonet, but I'd probably accept one just for the sheer novelty of it.