I thank Pete Decoux for clarifying my entry about the Dardick. I do know the difference between the true Dardick cartridge case, and the Dardick adaptor cartridges that act only to convert a full round of normal ammunition to the Dardick system, but as usual for me, I did not articulate that well. By the way Pete, “Mr. Moss” was my father - I am “John.,” especially to good friends like you. I thank the original poster of the question for the pictures of the tround with extended bullet - I had not known that they existed (I know nothing of the big trounds at all, hence my comment excluding them from my opinion). A good addition to my Dardick files. One of my original documents from Dardick mentions that the “reusable adaptors” were available for .38 Special Wadcutter; .38 Super automatic; .38 S&W; 9mm (as I mentioned, I have this one, although it is cracked from tension), .22 Short, Long, Long rifle; and WRF of standard make. It does not mention the .45 Adaptor, which I have and believe to be rare. It is black plastic. A letter from David Dardick in my files helps delineate the time line of these guns, at least at their beginning. The letter is dated November 25, 1957, in response to a letter of November 20th (try to get that quick an answer these days from a gun company!) and in part, says “We expect these guns to be avialable for public sale the early part of 1958.” There have been a number of good articles on this gun, but not much showing all the variations. Is anyone listening? IAA Journal would love to publish one, I’ll bet!