He's at the center of a brewing legal dispute that federal prosecutors say has the potential to upend the 1968 Gun Control Act and "seriously undermine the ATF's ability to trace and regulate firearms nationwide."
As O'Kelly sees it, the ATF has been deliberately misinterpreting a key gun control regulation for decades because officials fear that following the letter of the law would allow criminals to build AR-15s and other firearms piece by piece with unregulated parts.
He said he voiced his concerns to an ATF official two decades ago, but was rebuffed.
Now, however, his view is gaining traction in courtrooms around the country.
Former ATF agent at center of legal dispute over AR-15 | CNN
Ex-ATF agent Dan O'Kelly says federal law does not apply to a key component of the AR-15 and many other weapons, creating a loophole through which convicted felons could acquire a firearm piece by piece.
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