My worries is that the scope won't hold up to the recoil of the 308 granite the ar-10 is semi auto so recoil isn't as bad as a a bolt action gun. I have a bushnell banner on my dads 308 savage bolt action and it won't hold zero for any thing but when it was on my ar-10 I had no problems. So that's my concern on buying a "normal" Nikon scope.
"Life's hard. It's even harder when you're stupid." ¯ John Wayne
"If guns kill people then i can blame mis-spelled words on my pencil"