Bored out to +060" ? Cracked at the bottom flange. New barrels for both 750 and 850 Commandos should be available from your friendly Norton dealer now. Cast in aluminium to the 850 pattern (i.e. with thru bolts) in both 750 and 850 bore sizes with either iron liners or Nickasil coating. The new barrels weigh in at approx. 5kg, just over half that of a standard 850 barrel.