China isn't allowed to import magazines into the US anymore after the ATF sting in 1996. Also the Thermold is marked "made in the USA."
Besides, every single Chinese magazine I've ever used has been really high quality. The Chinese don't fuck around with guns. All of the shitty magazines I've dealt with have been exclusively American-made.
A well-built plastic magazine can last a very long time. See: Bulgarian Circle 10 magazines.
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