I'm not much of an AR guy. I bought a Colt 6720 for my daughter to hunt with and put a Guissele SSA-E trigger in it because I like good triggers and hated the stock trigger.

What would be a good choice in an extremely accurate upper I could buy? I'm not looking for the most expensive one but not the cheapest either. Just something that offers good value while still being very accurate. I want a flat top with no front sight. I don't care about having rails enough for a bunch of accessories. I will only need a scope and maybe a tripod.