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we also sold Magpul MASDA AKM and im also using one on the field, the M140 spring is installed only for importation and the internal of the AKM is not built to support it I would highly recommend you to change it for the stock spring that still chrono a 389fps on our bigdragon chrono, the Masada AKM is also equiped with a quick change spring, so you can change it in less then 2min.
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