i have never bought from red-X so i don't know how they are but they do seem to have some nice deals on hard to come by 9mm BCGs --seems like the ones i bought before the panic were $155 and i ain't seen them for that price in years. they mostly go for $200 since the panic-- a pro-mag block will work and they ain't pricy , so you could get into the 9mm AR for not so much $$$ if you mind your wallet and hunt those deals--
they also have some nice prices on saber uppers and other saber parts.
that $375 saber 20" upper is really tempting!!--