I can't find anything on this on the net, and I am wondering if I am making it up it my head.
I remember there being a single-action revolver available in the 80s with .45 Colt/ .410 bore chambering, that never made much in the way of sales. It wasn't made by a big manufacturer, and I recall that it had an odd appearance with a straight, flat trigger.
Did this really exist, or did my brain create it out of the description of the gun the hero carries in the middle section of "The Forever War," combined with seeing a Thunder 5 in the 90s?