look here..........I like Burris Signature dovetail style rings.......rear windage adjustment........

this base will work.......or.........go cheap with a Weaver style base.......

but then use Burris Signature Zee rings.....plastic insert.......no slip/no scratch.....

your 40 mm bell may be an issue with clearance.......straight tube 20 mm's go nice on lever guns

Midway # 616-271

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