Age old question: I own a Windham Weaponry AR 10, receiver stamped as .308 win. Can I fire 7.62x51 (NATO) rounds through it? Also, I own a Mossberg bolt action MVP Precision, receiver stamped as 7.62x51. Can I fire .308 win through it?

There has been much debate on this as well as the interchange ability of the 5.56 & 223 Remington. Long story short yes you can shoot the 7.62x51 in the 308 Winchester, but it is not recommended to fire the 308 Winchester in a 7.62x51 NATO chamber for the same reason as not firing the 5.56x45 NATO in the 223 Remington chamber (they are opposite each other) as there is a potential of an over chamber pressure issue. To recap: 7.62 NATO in 308 Winchester or 223 Remington in 5.56 NATO is safe. 308 Winchester in 7.62 NATO or 5.56 NATO in 223 Remington is NOT safe

Correct

Yes you can fire 7.62 X51 out of the Windham Weaponry 308. on your other rifle if it is marked 7. 6 to 5:51 you can shoot 3:08 through that rifle as well