Henning Magazine Spring for Sig Sauer P320 Extensions
Sig Sauer P320:
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12-coil Spring : Great spring for Compact 15 round mag and any of our Plus 3 extensions
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13-coil Spring : Great spring for Standard 17 round mag and our Plus 6 extensions
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14-coil Spring: For Long 21 round mag and our Plus 6 extensionsIf you are unsure what coil-length to pick, get the 14-coil and cut till you get the spring tension you want.