Question For Any Valmet 412 Owner

Are there any Valmet 412 owners here with shotgun / rifle combination barrels. I'm in the process of purcahsing a Valmet shooting system with 3 sets of over under barrels and a scope mount. I'm buying it mainly for the 12 ga / .222 rem barrel. It also comes with 20 / 20ga and .30/06 /.30/06 barrels. All matching serial numbers with case having the same number.

My question is the rail mount. Does anyone know the size? Is it 11mm as most European combination guns have?
 
I just bought one myself but it had the mount and Leupold scope already on it. Let me know how your gun shoots. Here I am having trouble getting Ammo. I load my own but everyone is sold out.
 
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