32" 4 notch RS rib. 18.4 bores and 1.680 KG. Barrels are ported and fixed M and IM chokes. At the muzzle end under the rib adjuster, it is missing the small piece of metal. Bluing is excellent, possibly re-blued in recent history. These will work nicely with your MX2000/MX15 SBT.