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Originally Posted by doofus47
2 other options of proof:
1. If there's a quality control manufacturing date/serial on the magazine that shows it was made after 2013.
2. A magazine type, say "Magpul Gen 5," which wasn't available before 2013.
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Those are covered in #3, which I've reworded a little bit to clarify.
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Originally Posted by ATN082268
Any alteration to a magazine, such as the style or material used, could be used to determine at least rough dates of manufacture.
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Yup—and as an example, some M&P9 FS mags I bought in 2014 have a different base plate design than mags that I purchased in 2013, which were the same as the ones that came with my 2011-production pistol. IOW sometime in the 2013-2014 timeframe, S&W changed the design of the M&P9 FS magazine in a distinctive way, and woe could potentially befall someone who takes a post-2013 17rd M&P9 magazine into CO.
These sorts of minor design changes are not always well-documented or advertised.