A friend asked me about AR10s which I know pretty much zero about and I have never owned one. He want's one to deer hunt with and plink, and he is on a relatively small budget. I assume the pricing is near bottom now like AR15s?

For an AR15 I would personally recommend an entry level "name brand" like a S&W MP15 sport. What would be something along that line in an AR in 308 rifle?

Also, he asked about a 308 upper to mix & match with a 556 upper on the same lower. I would assume they would need a different buffer spring, but again, I have no knowledge or experience on this 308 AR topic???