Lawmakers are trying to prevent the spread of 3-D-printed guns. They may be too late.

Lawmakers are trying to prevent the spread of 3-D-printed guns. They may be too late.  Washington Post Gun control advocates can't stop group from posting instructions to 3-D print a gun  CNN Judge blocks gun control groups' lawsuit to stop downloadable 3D-printed guns  The Hill I'm a sheriff. Don't flood this country with 3D-printed guns.  Chicago TribuneFull coverage

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