Originally Posted by tmitch
I checked the aperture threads from my 1937 M71 and, as close as I can measure, it came out to .218" diameter with a thread pitch of .025". That would work out to be 7/32"-40 TPI or 12-40.


mitch ol buddy. Is yours an original bolt peep???? It would look like this one I had on my '37 deluxe:

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These ads clearly shows a factory bolt peep used on an early model 71:
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For that matter, is this what the OP is referring to? Some here post pics of the redfield peep and call it a factory "bolt peep". Congrats to the op on buying a fine rifle too. The model 71 348 Winchester is a sweetheart of a rifle.

Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

BSA MAGA