None of the pictures posted are of a Valmet M76S.
As sold in the US the M76S was a .223 available with 15 or 30 round magazines. Itslayout was more AK like than the pictured rifles. Rather than the peep sights on the dust cover the M76s Valmet had a open notch tangent sight right were most AKs have one and the front sight was mounted just behind the flass suppressor.
SOme were used in an episode of the "Magnum, P.I." TV show to simulate AKs as few AKs were available to TV production companies at the time. Styer had not even begun importing the Maadi AKM yet much less the COmblock flood.
Perhaps the rifle OP shows is an M76, But it does not look like the M76S I handled or appears in the firearms section of gun annuals from 1979 or so.
I think some are confusing the Finnish M76 with the Yugo M76, not the same gun.
-Bob Hollingsworth