Here's what you're going to encounter when you shop for the correct rings. The terms low, medium, and high are definitely NOT standard from one brand to the other. One company's "low" might very well be higher than another company's "medium". Some companies measure from the base to the bottom of the scope barrel and some measure to the center of the scope barrel; be careful.
A "50 mm" scope refers to the lens size. The actual OD of the front end of the scope can be slightly larger in diameter or significantly larger in diameter. Finding out about this particular measurement is easy with some scope manufacturers and nearly impossible for others. Then there is the front lens cap to consider; one of mine has a notch on the bottom so that it will slide on properly because I cut it too close when selecting those particular rings.
Don't forget the question of what goes between your scope rings and your receiver. Add a rail of some sort and you have another mysterious dimension to try and chase down. In addition, a 10 or 20 MOA tapered rail will put the objective of the scope closer to the barrel. Remember that High School Trig?
Finally, if your rifle has a Bull Barrel for target shooting, your scope/barrel clearance will be different than it it has a slim barrel profile designed for a hunting gun.
Bottom line: Finding a set of rings which will mount your scope properly isn't necessarily easy. If you're trying to get your scope as low as possible without touching the barrel, the process is even more mysterious and frustrating.
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