| Another option, if they still make it, is the "Tri-Burst".
When the double-trouble came out, I wanted it.... but didn't want to pay that much.
By chance, I happen to see an advertisement in a shooting magazine for something called a "Tri-Burst". It attached to your trigger guard, to make a firearm shoot a 3-shot burst, and still be legal. It was only $20, so I bought it.
When it arrived, I was a little disappointed. It consisted of a LONG trigger, connected to a cam with 3 "pegs" on it. When you pull the trigger, the pegs would activate a linkage, which would push the real trigger.... 3 times.
It sorta worked when you pulled slow, but didn't seem to work at all when you pulled fast. So, not very usefull, but it might offer an alternative approach for an external mechanicam using a cam-shaft, with 2 or 3 sprockets.
nick
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