I'd buy matched uper/lower rather than buy them saperately, especially on billet CNC receivers.
Miss mached upper and lower from differnt manufactures (or forged and bilet ) can have very high possibility of fitment issues, either too tight or too lose.
NEA have very good wattanty. Take a bit of time, but they do stand behind their products and willing to slove your problems.
I prob buy an other set for PDW build, and i wish to see their AR10 in the future.
Been a firearm manuafacture in this mostly left-wing driven country is hard, and try to mass produce everything in house, in canada, is even harder. Those canadians bravely chosed a bumpy road rather than sources items over the boarder, and getting better everyday, they are the real drving power of canadian industry. That's some great spirit that we have been neglacted for a while. Let's not forget the tragedy of Nortel, Blackberry, Bombardier, ext, we should supprot our own industry.