The only one I have shot was on a Ruger 10/22 and it dd not work that good. It produced some laughs and giggles when it worked, but it was fussy about ammo and how you shouldered it.

The same fella had an AR with a strange trigger. It would (obviously) fire when you pulled the trigger, but it would fire again when you released the trigger. The safety was like a full auto, and you could use it normal semi-auto or the double tap. More practical than the bump and nearly as fast. But the trigger pull very much sucked in either mode so just another way to wreck a rifle.