Mossberg OEM 16" .223/5.56 AR Barrel
AIM has some of the 16" m4 style barrels in melonite finish .
this is the same as the coating on glock slides, several big name firearms firms use a similar process to coat the inside and outside.
i sort of wish i had got one of these back when JSE had um in 14.5"--
but i am "upper poor" right now--LOL