There's a fellow who shoots an Olympic Arms 7.62x39 at the local range, it is amazingly accurate. He's let me shoot it once, even I drilled holes in holes with at 50 yards. It put my milled Arsenal to shame. I'm talking cheap Wolfe Russian 125 grain stuff.
I was inspired enough to consider a no name upper at an LGS but no one knew anything about it. No idea as to mags, warranty, twist, parts, nothing. I told them I would not spend $600 for something no one knows anything about, they politely showed me the door. So be it.
I also considered the ARAK, I was advised to let that one simmer for a while more, extractor issues I heard.