best bang for the buck accuracy wise is the rra varmint uppers. they are stainless 1/8 twist air gaged cryoed wilson barrels with either flat top or eop rails. for your scope a flat top is sufficient.
i own one of their national match uppers same barrel and i routinely shoot .5 moa to just under 1 moa up to 300 yards (max at the range i shoot at) with open sights.
the rra uppers are hard to beat for accuracy in a complete out of the box upper
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