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Those don't generally have any ferrous components.

yes but the spring in the magazine does.

also the rails on the lower, the barrel, etc.

Not in the context of someone smuggling a weapon through a security checkpoint. At least not unless they're certain that it's small enough not to trigger the detector.

That said I will note that it is generally illegal to possess such nonferrous weapons regardless of circumstance.

And it is, again, completely irrelevant.

How does a plastic pistol open the cockpit door? It is proof to small calibers. You might shoot someone in the plane and then you will be subdued and ghaddafied with a SkyMall magazine. Not the most effective form of terrorism.

Countries that didn't create the TSA also had a reduction in terrorism.

I agree. Such a pistol won't even get you many shots before catastrophically failing.

But upthread it was suggested that metal detectors are sufficient to stop weapons and a discussion of 3D printed guns followed. Nonmetallic weapons (and other tools) of all sorts are possible, 3D printed or otherwise.

If you want a gun you can use more than a couple times need metals. However if the goal is one shot plastic is good enough. Even plastic bullets will work - not well, but one well placed/timed shot is all we are talking about.

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