Once again, they've been around for years. I fired a .38 special derringer in the early eigthies in Paderborn. It was part of the 'armoury' of a guy that owned a couple of clubs on the strip in Sennelager. His 'minder' kept them in a briefcase with a Luger and a P 38.
Fun afternoon it was, few hundred 9 mm from our Brownings and then a play with his exotica.