Welcome to RFC where you can find enough information on most of the rimfires, shooting techniques, and gunsmithing advice. Read the sticky above on dating the 39A you might find your answer there. Another thing that I recommend new members to do is to read all of the posts in the forums about the guns that you own and shoot, or are thinking of buying. Some of the forums I know have multitudes of posts-so you just might want to go back a few years. You can also search each forum, of do a google search to find the info you want plus some.
Hope this helps.
BR
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