I would assume you are doing a DMR type role or more of an EBR? My 20" POF .308 is set up as a DMR with a Vortex 2.5-10x and Harris bipod. If you were wanting more of an EBR role, I would recommend the Vortex Razor 1-6. Both are serious cash, but these top tiered ARs deserve more than a Wal-Mart scope lol
Remember purpose dictates the optic not platform.
That's what I kind of learned after 30+ years of shooting.
If you want a good quality optic without spending an arm and a leg, check out the Nikon M308. Sweet scopes man, make sure to check out the M308 mount with the built in 20moa.
No way I would put a scope with a plastic gear system on a gun like this. There are much better scopes much cheaper.
not only that but they have a total of 40 moa internal travel so putting a 20 moa base on it will probably kill your chances of zeroing below 200-300 yds.
I'm really trying to quit having these debates, but some of the things I read on the Internet makes that impossible.