As ColoWyo mentioned the RRA Varminit 20" upper is very accurate, my buddy has one, and it's a shooter. Good value for the money spent. I recently bought a LMT MRP rifle length upper with 18" stainless SPR barrel. It's a sub-moa upper, and with Black Hills red box 77-gr, I shot a 0.24" group with it. I was lucky because the trigger is pretty bad, but think I could shoot consistant groups like this if I had a better trigger.