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Pat, Smith and Wesson will be your best source for direct fit replacement barrels at S&W Customer Service: 1 (800) 331-0852

while any standard AR-10 barrel should fit I suggest checking with S&W at: 1 (800) 331-0852

Pat, Here is an 18 inch stainless steel barrel BUDs has that will work.-------https://www.budsgunshop.com/catalog/product_info.php/products_id/3195/cmmg+38dcc0a+barrel+sub-assembly+308+winchester%2f762+nato+18%22+stainless+steel Plenty of 20" barrels out there. CMMG, Bravo Co, Daniels Defense, Ballistic Advantage, DPMS and many much more expensive options. Like Faxon, Criterion, AeroPrecision, CBC Industries, Ranier Arms-------- Rainier Arms Ultramatch MOD2 20" M110 Profile 1-10 Twist 3/4x24 Barrel .308.