Replacement magazine springs for your Grams follower kits:
Grams spring is estimated to last 200+ uses per magazine. So if you have a 20+ round magazine * 200 = 4,000 - 5,000 rounds per magazine. Let's say you have 5 mags, plan to replace your springs every 20K rounds and you will be on a very safe maintenance schedule.
Grams offers two spring lengths:
The 11-coil kit is designed to work for 141mm magazines (USPSA Limited/Carry Optics Division).
The 13-coil kit is designed to work for 171mm magazines (USPSA Open Division), or for Sig Sauer P320 21 round magazine with our H141 = 27 rounds.
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