It’s still running OK after about 50 mags on my G22. Can’t tell if it’s holding zero with my astigmatism. 
I did beef it up with additional M3 grub screws ana a good dose of loctite
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I had to look that up after I put my glasses on 
Astigmatism.
Never heard that one before and I’m sure there are a lot more like the one I’m going through now. Lots of new words LOL
Haha, which Donkey Kong factory Friendly Fire 
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Although I do get mag tisms 3,2, 1, empty. Watch out for the poss toy going flying
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Remind me to not bump into you in to you in a dark ally