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That belong to redrifle section but i will answer Dont spend money on mount that replace the rear cover, they need fitting and wont hold zero anyway,big waste of time and money. If you really want to mount some optic 2 ways to go. First its a choate mount that mount on left side of receiver but require drilling and tapping holes. Second is a scout mount that replace the rear sight,best used with a red dot scope or long eye relief scope. for more infos, visit this link: