Well, we're on page three and no one has given us firing pin separation figures for the three frames. And what's this millimeter business? Doesn't anyone own a common old Starrett vernier caliper any more? Can't we get to the bottom of the question about whether the big 12 and the little 12 have the same firing pin separation? How about the question about whether the little 12 and the 16 have the same or different firing pin separations? Before this thread, I had no idea that a light 12 was one of the options. Live and learn. Sure wish I knew that Dave was selling the "horse".