Going entirely from memory, though the Perazzi MT-6 was named after the 76 Olympics in Montreal, I don't think anybody actually used one there. Different than the 68 Olympics in Mexico where the MX-8 was designed for and used by Matterelli of Italy.
Would you be thinking of the Rottweil, used by the German
Olympic skeet champion?
Maybe a Franchi? Franchi gave Don Halderman one of their shotguns to evaluate, Don said it was a piece of crap. He won the gold with a Krieghoff model 32 with a release on the 1st. shot. No flinching problem, just it was faster for the follow up 2nd. shot. Don and I worked together for 20 years until he had the 1st. stroke. Later Franchi demanded he give the shotgun back, that was no problem for him.
Even as early as 1976 Danielle P. was feeling the need to introduce a less expensive model for the American market. I've seen several of them and they could not possibly have been meant to compete with - let alone replace - the MX-8. For what they were charging, however, the MT-6 did represent value (if not style).
The problem was (and still is) that while people love to bitch about the price of an MX-8/Mirage, they'll save their money and get an MX-8 rather than settle for a cheaper model like the MX-4/MX-7. My $0.02 -John