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I use only Challis bushing O rings, grip screw O rings and grip screws. Great product, consistent quality and great customer service. What's not to like???
Since I like to pull the grips off periodically when I'm cleaning, the bushing/grip-screw o-ring combination works quite well for me. I haven't noticed any loosening of grips after 50-100 rounds at the range (which I used to get constantly without o-rings).
These are now the only ones I will use. They are the best!
I had bought some accent hex screws that were slightly undersized. Not sure if I needed the o-rings for the screw or the grip. So I installed both. Grips are now nice and tight and don't slip.
Been shoveling 2 ft of snow instead of shooting, so time will tell if they help keep the grip screws from backing out