Erik, you are right.

A "bullet head" or "head" in RSA and I presume Zims is what we in America would call a bullet, or a component bullet. It is not loaded ammo. And the description in Nitro's post seems to indicate that as well. But who knows, this info comes from a media reporter.

Having said that, the guy that got caught seems like a dim bulb. Getting on board a plane with two pistols? Why, the fellow is even stupider than Teddy Kennedy's bodyguard...