This sounds unconstitutional and a publicity stunt.
Check it out:

Using a procedure that prevents constituents from knowing which Republicans voted in favor of a ban on plastic guns, the House extended the Undetectable Firearms Act for another ten years Tuesday.
The original bill was passed in 1988—the height of the anti-Glock/plastic gun frenzy—and has twice been renewed since then.

According to The Hill, the extension bill was sponsored by Rep. Howard Coble (R-NC), who claimed the bill had “overwhelming bipartisan support.”

Democrats were eager to support an extension of the ban. At the same time, they believe the ban needs to be updated “to take into account technology that allows plastic weapons and weapon parts to be produced on 3D printers.”

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