The problem with the Hellfire trigger, which I have one of, is that it basically relies on the recoil of the gun. You're supposed to hold the gun very lightly, and it bounces back and forth against your finger, firing the gun. It's legal, (The Hellfire trigger actually comes with a copy of a letter from the BATF stating that it's legal. They recomend that you have it on your person at all times when you're using the thing!) because it's your finger pulling the trigger, and you get one shot per trigger pull. But you can't aim the gun while you're doing this! I don't know about "Trifire", but I keep my Hellfire trigger in the hollow kelly grip of my Calico, so that I won't misplace it.
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