[E. Pluribus Unum]

I'm not a gunsmith, but I'd imagine it would be possible to fabrcate a barrel out of ceramic, reinforced with carbon-fiber-epoxy if need be.

I guarantee you such a barrel would be radio-opaque. It would show up on an x-ray.

[supercat]

I guarantee you such a barrel would be radio-opaque. It would show up on an x-ray.

Yes, but airline passengerspaeons aren't (yet) given cavity searches when they go through magnetometers.

Of course, knives that can get through metal detectors are stone age technology, and crossbows aren't all that much newer.

[07055]

I guarantee you such a barrel would be radio-opaque. It would show up on an x-ray.

How about the metal detectors that you walk through? Are they senstive to the same things as the x-ray machines?