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Yes Dennis, Smith and Wesson offers an 18" Barrel if you already have the rifle. S&W contact is here to order : 1-800-331-0852 Mon-Fri 8:00AM-6:00PM Eastern Time. If you do not have the rifle already i would recommend the buying the 18" model here : https://www.budsgunshop.com/catalog/product_info.php/products_id/85799/Firearms/Rifles/Smith+%26+Wesson/M%26P+15+Rifles/S%26W+M%26P10+Mid-Length+10%2B1+308WIN%2F7.62NATO+18