FN America AR-15 5.56 NATO 18" M16 Profile Rifle Length Barrel, Black Phosphate - 20100042

FN America button-rifled barrel for AR-15 platforms, chambered in 5.56 NATO with an 18" length and M16 profile contour. The barrel features a chrome-lined bore and chamber for corrosion resistance and extended barrel life, rifle-length gas system, and is manufactured from U.S. sourced Chrome Moly Venadium steel with high pressure testing and magnetic particle inspection for quality assurance.