Used A&K M249 OEM inner and outer barrel set. Outer barrel has scratches on the underside of the barrel from previous owner and would best fit a Mk2 M249 because of the wear. Asking $20 + shipping OBO. Able to provide more information upon request. Shipping available to anywhere in the U.S. via USPS flat rate shipping. Please be PayPal ready, I'll cover PayPal fees if you cover shipping.