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They are a magazine spring reliability upgrade and as far as I know, you can only get them through that link. Grant also sells a good aftermarket magazine spring. P-mags do not come with the red spring and I am not sure that the red spring will work in P-mags, as they are for GI mags.
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There are a few parts I need from Specialized Armament, so when I place the order I may pick up a few of those springs as well to check out.
Thanks,
Donka
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Unsupressed, how many rounds do extractor and ejector springs tend to last?