Description

SaltWater Arms MCRR Blackfin AR15 rifle Upper, Semi auto .556 / 223. These rifle uppers are built with Maritime Corrosion Resistant features like Stainless Steel barrel and muzzle brake. Stainless Steel pins, screws, detents and corrosion resistant springs. Stainless steel / nickel boron full auto bolt carriers. If you are looking for a AR15 for marine exposure of high humidity Coastal areas this may be the rifle upper for you!