I said they were designed for internal use, not “these are internal use only”. There’s nothing to stop them from using them for external carry, and indeed they do. It’s possible that they’re cheaper to produce and therefore likely the first bombs to go when a bomb needs dropping in say a low-intensity war like Afghanistan or Chechnya, but it’s not like they don’t have a lot of the other variant either.

I don’t doubt it, I’m just pointing out that you don’t see them nearly as often. OR it could just be like the Mk117s “let’s use up all the old stuff”.