the height of the rings is goign to depend totally on you. you need to be able to rest your cheek on the buttstock and instantly be able to pick up the crosshairs, if you have to mash your face into the rifle then you need higher rings, if you have to rest your chin on the buttstock or completely lift your face from it then you need lower ones.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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