I was 200 miles into a trip with two great friends. I looked at the driver and asked "Boss, what is your name anyways?" He said Joe. What's yours?" Well, it's Mark. I looked into the backseat and asked my buddy there. David, he said. We have not used them since. Knew those guys better than a decade at that point.
I put one on my SKS many moons ago. Never got it to work right. It's in a drawer here someplace. It works to for e the trigger forward. Early for ed reset trigger I guess.