cal: 5.56 NATO, semi-auto, (2) mags, barrel: 17.5" 1/7, includes nylon sling, factory box & paperwork, MBUS flip up sight, adjustable rear stock, seller states "fired 100 rounds", sn: 20J027735, NOTE: There is a $25 transfer fee per firearm for transfer and/or processing payable to Gun World, whether the firearm is picked up or shipped.