I came up with an idea to make a bolt-on geared "pump" that would make a little piston move back and forth. The pump could then be mounted so that the piston pushes the trigger multiple times, simulating full-auto fire as you push and pull the pump. It would really be no different than the GAT trigger, except instead of rotating a crank, you would slide the pump back and forth. It meets the BATFE requirements of one shot per trigger pull. And, I'm fairly certain it would work. The problem is that if it does actually work BATFE will figure out a way to stop it.
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