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There's no comparison between the factory spring on the left and the SureFeed Magazine Follower Spring on the right. The SureFeed Magazine Follower Spring for the Ruger MK IV is 25% stronger than the factory spring. The increased spring rate improves feeding in all Ruger MK IV magazines.

The SureFeed Magazine Follower Spring will eliminate feeding issues caused by the round either being stuck or slow to feed from the magazine.

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