Rep. Diane Feinstein has gone a long way to draw the ire of military members and gun owners alike. Much of it has to do with her admitting to having a concealed carry permit and then going on a crusade for stricter gun control.
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They also named it the "Feinstein AK Mag," after the aforementioned congresswoman.
The AK-47 is a particularly nasty weapon, so it's noteworthy this magazine held up.
Defense Distributed plans to put schematics out here for download.