I just Googled that>> http://www.kiddinnovativedesign.com/KIDD-Two-Stage-Trigger-Unit-for-the-22_p_11.html
That must be for those one hole punching heavy barrel guns. I'm not quite that serious about it. That is more than the gun I would put it on.
I'm referring to bone stock new vs. old---just a plinker.
To think how much more fun many years ago the above trigger/s could have been. I and friends of mine have burned up many many bricks of 22 through my bone stock 80's era 10/22 with a simple Tasco Red Dot---shooting skeet. I'm actually referring to straight away "pasture" trap.
To tell somebody what we were doing---everyone called BS. Then we invited them out, and they did it with us. Throw a straight away pigeon and put the red dot barely under it and just start plinking. I think the best any of us ever did was one bird in three shots---more often one bird in four or five before out of range.
It really was a blast. You could actually just barely hear the pigeons shatter.