Two decades before a secretive gambler lugged an arsenal that included 12 “bump stocks” into a Las Vegas hotel room and opened fire on concertgoers, a 40-something ex-Marine was tinkering in his Florida garage, looking for a fresh take on an old idea. Inspired by footage of the heavy recoil of anti-aircraft guns, Bill Akins wondered if he could design a device to harness a semi-automatic rifle’s recoil to fire bullets at a frequency near . . .
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