DPMS has some 16" uppers on hand, 16" bull with the metal free float handguard...not too sure about pulling the trigger on one as the standard dies and brass seem to be non-existent. I've got the 556 twin to this upper and it is a great shooter. Factory ammo is available for the moment, but Remington has a habit of abandoning it's offspring if demand isn't sufficient, which is sure to be the case with no real source of rifles.
