DPMS 16" AP4 M4 Profile Barrel 1x9 Moly
JSE has 50 16" barrels in stock .
these are the AP4 barrels i don't know if their chrome lined --
i suspect their regular 4140 steel with no chrome for the bore/chamber.
i know the 14.5" and the 11.5" are chromed and some of the 16" m4s are chrome and others are plain.