Those are ranger rings, a copy of the Tikka ones. I had a set of those on my PRC, what a balls up. Throw them in the bin, far away from your rifle. They caused me nothing but problems, each time I went to the range I had to re zero. I couldn't figure out what the heck was going on, went to take the rings off and the screws were loose. They were torqued to 18 inch pounds with blue locktite, still came loose.
Throw them in the bin and get something else, I replaced mine with a second hand set of Talley's and never looked back, no more re zeroing just happy shooting and confidence that when I finally get the time to get out for a hunt, my rifle will be on point. It may seem like an extra cost buying replacement rings, but for all the mucking around and ammo you'll use during the process of trying cheap fixes, you're better off replacing them, sighting in one last time and then being happy. Let us know how you get on
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