Oh, it's an M59. Nice!
Looks to be a G10, so technically a commercial "M59" fabricated from an already built M59/66A1, restocked, rebarelled, scrubbed,and restamped. They are exceptionally nice rifles.
7.62, did you get it from J&G, AIM, Wideners or on the secondary market? They all had them at one point in time.
They are beautiful rifles, here's the canned photo AIM used to sell them: