At a glance: Shot-peened spring offers longer life than factory spring Reduces failure-to-feed issues Replaces old, broken mag springs Upgrade your RugerA(R) MK series magazines with aftermarket RugerA(R) magazine springs from TANDEMKROSS. Magazine springs wear and tear over time, reducing the performance of your magazines and resulting in failure-to-feed issues. Don't let an underperforming or missing spring derail a shooting sports competition or day at the range! The new "Green Springs" for RugerA(R) MK Series are shot-peened for a significantly longer life than the factory spring. The upgraded magazine springs reduce failure-to-feed issu Mfg: Tandemkross