I recently acquired a Remington Model 11 military shotgun with all of the correct markings and dimensions. What has me puzzled is the date code on the barrel. By all accounts, the AM means it (the barrel) was manufactured in March 1921 or 1965. That doesn't make sense to me since the SN of the receiver 480xxx puts it solidly during 1940's wartime production. Any theories on the odd barrel date code? I've seen one other AM date on this model shotgun, it was on the RIA site a while back. Thanks much in advance for your help.
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