Composite Pistol in "In the Line of Fire"

[2wingo]

Originally Posted by MoviePropMaster2008

I remember that. It came from the Bullshit urban legend that the GLOCK was invisible to Airport metal detectors, remember those days? the gun control idiots got a lot of mileage from that one, even though NOW, most police departments use the Glock.

It expired in 1998 but was re-authorized in 2003 and is set to expire this december (2013). With the advent of 3-D printing, you KNOW, some idiot politician is going to make a law banning the mythological all plastic gun again.....

What exactly IS 3D-printing, vis-a-vis guns, and why is everyone in an uproar about it?