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I had a "BMF Activator" which worked flawlessly on a 10/22. It attach to the trigger housing and looked like a fishing reel handle. Each time you turned the handle a full revolution, a cam pushed a piece of plastic against the trigger three or four times. Since you had to crank with your left hand and hold and aim with your right, it worked best from a rest. It would empty a 30 round clip pretty fast!
A local gun store had two 10/22 actions mounted sideways with their tops facing inward and the magazines outward on a contraption with a tripod. It had a crank like a gatling gun that did the same thing as the BMF Activator- but to two guns at the same time. They were set to hit the same point of aim at 100 yards. It was all welded together and pretty sturdy looking. They wanted $1000 for it at the time.
This was 17 years ago, and I don't know if either are legal and/or available.
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