Not so sure, shape of the frame / electronics housing is completely different from production-series MG5. Could be a prototype, though, shape of the cocking lever and the comp are quite distinctively MG5, and barrel contour matches, too. Perhaps custom e-trigger on a MG5.
Today I met Cesare Morini on the shooting range. I showed him the photo and he said, that it is Matchguns (rebuild). Unfortunately Cesare doesn't speak English/German - therefore no more details.
Go to the matchgun website and they are pictured there. In the USA, call Neal Stepp (ISS) and he can order one for you if he doesn't have one in stock.