i actually own a m91/30 mosin nagant with the iron sights that i use for hunting. they seem to work fine for me. but if you really feel the need for a scope i would suggest the p/u that was designed for it. this is so the bolt handle will clear under the scope when pulled back. they are still available for around 25-45 dollars depending on condition and dealer. of coarse with that option you will also need the curved bolt handle which may run you about 40-70 dollars. and honestly is kind of a pain to switch.
hope this was helpful
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