Just a gueery on those replacement barrels are they going to have the bayonet lugs on them, I am not real certain but I think MAB do the No.4 barrels in the parkerised without the bayonet lugs if you want to be semi pure you can have them put on as an extra.
8><----
MAB is now TSE engineering and a barrel off them and getting it fitted will make your eyes water. Its also 6 groove and yes lacks the baynot lugs, they will also do it in SS for $150AU more.