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Rimx 5 round mag extension

They really need to come out with a longer/more power of a spring and include them with the extensions. This is coming from my IPSC/USPSA background. You wouldn’t take a spring from a 140mm magazine and use it in your 170mm magazine. If you do your just asking for problems.
And like reubinski’s buddy I could never get mine to work without having issues with the round being captured by the tensioner/extractor which I personally believe was from too weak of a spring .