Interesting. I just looked at mine and it does not have a dropout trigger. The bottom of the action is sort of rounded. The barrels are completely separated, kind of like a Krieghoff and not at all like the separated barrels on my MX-8/20. It has Perazzi MX5C in gold on the left side. Definitely sleeker than other 12 gauge Perazzis. I have not seen another like it. As I said before, there Is certainly enough variation among Perazzis that would warrant a book. Of course, the competition history and success and the early collaboration with Mr. Fabbri would also be very interesting.