While it's an old thread I did not know about Mesa's generosity, Thanks you!
While La Rue may or may not ship their lowers here still (lowers only, I think he'll ship the upper receivers), I've purchased both a lower & upper here in CA & both are well worth the money.
Are we at last brought to such humiliating and debasing degradation, that we cannot be trusted with arms for our defense? ... If our defense be the real object of having those arms, in whose hands can they be trusted with more propriety, or equal safety to us, as in our own hands?