Single-stack 1911 magazine springs keep your USPSA Single Stack division gear running clean through a full season of matches and practice. The 1911 platform's tight feed geometry means spring tension directly affects nose-dive angle and chamber entry — too light and you get malfunctions, too heavy and the slide won't strip rounds cleanly under recoil. Competition-grade replacement springs from Wolff, Tripp Research, Chip McCormick, and Metalform are built to consistent tension specifications that factory springs often fail to maintain after a few thousand rounds. Wolff's variable-power options let you tune spring rate to your specific load, useful when running soft 165 Power Factor loads that produce less slide velocity. Tripp and Chip McCormick springs are engineered to pair with their own magazine bodies, keeping tolerances tight throughout the feed cycle. Pull these whenever you're replacing followers or inspection reveals set or corrosion. Running eight rounds of .45 ACP or 10 rounds of 9mm in Single Stack — either way, the spring is doing real work every match. Fast same-day shipping on most orders at Shooters Connection.