Hope you get a good response from them.
Mine 642-1 has a neat trick. I was doing some dry fire the other day in a dimly lit room. I was using my reflection in a mirror to practice quick shots to the head box. First few trigger presses made me do a double take. I could see sparks! Really took me a minute to figure out what was going on. Every time the firing pin would drop a small amount of sparks would shoot out of the firing pin hole. Weird. I don't have a ton of rounds through it. Maybe 500 or so. Seems to work fine. The cylinder release needs to be tightened up fairly often but other than that seems okay.
Reminded me of those little plastic translucent spark guns that were around when I was a kid.