I recently purchased a set of rings on eBay for my M-77 mkii compact 260. I sold the original scope on the gun and the rings were pretty dinged up so I decided to get new rings and a scope . I wanted to keep it original so I actually found the exact original rings in original packaging. When installing it’s easy to notice the rings aren’t perfect as they are cast not made cnc. I’m sure the hole itself is fine but you can see the difference that’s for sure. When mounting my scope i literally had to press the top 1/2 of the ring onto the scope tube for it to go in place and i know it had to of drug the finish off the scope a little. Yes I’m sure I had the correct ring 1/2 on each side . They don’t intermix . Also when torquing with my FAT wrench on the flathead screws i went back over the screws several times and continued to get 1/8 turns several times even paste the torq setting . I chose 19-20”lbs. I thought this was odd I’ve never had a set of rings that seemed to gradually tighten even after torqing. After going over them about 4 times . Finally all 8 screws stopped moving and the wrench would click without moving any further . Any of you guys seen this with the old ruger rings with flat head screws.