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William, FN Herstal Customer Service/Accessory Dept. would probably have the most accurate answer at (844) 897-0675 ---- https://fnestore.com/slp-mk1-barrel-assembly-22-in-rifled

William, Field barrels are available. Here is a 30" barrel here------https://www.budsgunshop.com/product_info.php/products_id/58119/fn+herstal+30%22+matte+black+12+ga+slp+barrel+w%2fmodified+inve And a 24" barrel---https://www.budsgunshop.com/product_info.php/products_id/58116/fn+herstal+24%22+matte+black+12+ga+slp+barrel+w%2fmodified+inve