(NBC NEWS) In the days since it first hit the Internet, the blueprint for “The Liberator,” the first known 3-D printed gun has been downloaded more than 50,000 times.

Spain led the download pack Monday evening, with the U.S. in close second. “This is a level I’ve never seen before,” Cody Wilson, the provocateur behind not-for-profit 3-D gunsmith Defense Distributed, told NBC News.

For as many people who hit up DefCad.com to download “The Liberator,” even more came to look. At peak traffic, around 7 p.m. ET, DefCad.com received approximately 35,000 hits per hour, Wilson said. (Normally, a new blueprint attracts 1,300 hits per hour on average.) The Web administrator had to add mirror sites to keep the main site from crashing.

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