From a report at the link below:
Gun-rights activists have reached a settlement with the government that will allow them to post 3-D printable gun plans online starting August 1.
The settlement ends a multi-year legal battle that started when Cody Wilson, who describes himself as a post-left anarchist, posted plans for a 3-D printed handgun he called “The Liberator” in 2013.
The single-shot pistol was made almost entirely out of of ABS plastic — the same stuff they make Lego bricks out of — that could be made on a 3-D printer. The only metal parts were the firing pin and a piece of metal included to comply with the Undetectable Firearms Act.
Needless to say the gun grabbers are going ballistic (pun intended).
Full report here.