I say 130mm as an example as it was shown of modified CR2 but there needs to some preparation to easily switch to the next big common cannon that NATO will use, whether that is Rheinmetall’s 130mm or Nexter’s 140mm, the 130mm is probably a better choice but there needs to be an easy way for changing in 50 years when humanity are somehow still alive and the British government are complaining about the cost of things but don’t want to fix anything. At least the CR3 will be sharing the same ammo with its German cousin