Interesting indeed. Unfortunately I sold that MX5C 20 years ago and can't provide a pic, . My barrels were not separated either. A pierced side rib, like my MX8. The gunshop in England said it was an attempt by Perazzi to introduce a light competition gun.
The only seperated barrel Perazzi I owned was an MT6, sold to a very talented young shooter who wanted to get into International Trap and did not have much money, so I sold it to him for what he could pay me, not much money, but an excellent cause, right?