drilling and tapping
Something to keep in mind is that on most of those old Cooeys the barrel is not perfectly square to the receiver. Even with a proper fixture ensuring holes are drilled perfectly square with the receiver you will still end up needing windage adjustable scope mounts. Learned this the first time I did one, spent a lot of time ensuring everything was perfect with the receiver, I neglected to notice the end of the barrel was pointed off to one side slightly due to crooked threads.
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