Quote Originally Posted by RobF View Post
Nope. Some items made it, some didn't. It was a transfer so the items were unloaded. The problem was further compounded by the items not being stored in Brussels firearms area, they were left in general baggage. The rifle and another firearm marked baggage became separated. One was delivered, another left near the door on an unsecured warehouse.

IATA classes compressed gases as Class 2 Dangerous Goods. Not prohibited goods. They can fly when the correct processes are followed. That is probably not what RM want to do so they don't. Fair enough. But it isn't against flying regs for compressed air to fly unaccompanied or otherwise.
You seem to be trying to demonstrate that a rule doesn't exist because in a totally different set of circumstances, a rule that didn't apply under those circumstances, was not complied with

Compressed gases/pressure vessels are prohibited, in the post, by RM/PF,

Guns in the general post (air mail) are prohibited flight by the CAA.