20 x 110 RB OERLIKON "S" Mk-2 & MK-4


What is the difference between the Mk-2 and Mk-4 20 x 110 RB Oerlikon “S”? Do they use the same projectiles?

  • From what I know the difference is like this: “MkI” means “brass case, original primer”; “Mk2” means “brass case, British type primer”; “Mk3” means “steel case”; “Mk4” means “brass case, reinforced primer”. Liviu 03/23/07