Question: are psa barrels chrome lined?
Answer: Features. Barrel: 16" Mil-spec barrel steel, mid-length gas, Special lighter profile barrel, chambered in 5.56 NATO, with a 1/7 twist, chrome lined bore and M4 barrel extension made for us right here in Columbia SC by FN Manufacturing. ... Barrels are marked "5.56 NATO 1/7 CL MP Palmetto".