Wow that's unfortunate. How similiar was that concept stock compared to this one? Being that it in no way alters the factory trigger, the ATF supplied a letter stating it's approval without restriction (available on their website and included with every stock).The "approval" on last one of these bump devices got rescinded by ATF and everybody that bought one had to turn it in or sign an affidavit saying they destroyed it.
Great Article Dan,Here's where I read about it. Read the article under the video. The inventor seems pretty confident, but I dunno...