White Sound Defense Full Size Magazine Springs for Glock- 9mm - .357 Sig - .40 S&W

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Recommended Fitments:
  • 9mm 17 round w/ Standard baseplate
  • 9mm 19 rounds w/ Glock magazine extension
  • .357 Sig 15 rounds w/ Standard baseplate
  • .357 Sig 16 rounds w/ Glock magazine extension
  • .40 S&W 15 rounds w/ Standard baseplate
  • .40 S&W 16 rounds w/ Glock magazine extension


White Sound Defense magazine springs are designed to withstand extended field use. These exceptional quality magazine springs provide approximately 10% higher average pressure than standard springs. The additional pressure is designed to improve reliability with tactical lights and improve feeding in dirty/dusty environments. These springs are also longer than stock to better maintain spring tension when using magazine extensions. To compensate for the additional length the coils have been offset in order to ease seating during tactical reloads.

In the field, the real threat to spring life and function is corrosion. Condensation, rain, sea water, and sweat all contribute to the corrosion of magazine springs. Corrosion creates irregularities in the surface of the wire. These irregularities result in stress risers which lead to the formation of cracks in the spring wire. Once these cracks start, it is only a matter of time before the spring fails. Music wire, chrome silicon and chrome vanadium are all very vulnerable to this type of corrosion. For tactical or military use, modern stainless steels are the best available material choice.

These springs are made from 17-7PH stainless steel. 17-7PH is a precipitation-hardening stainless steel that provides high strength and excellent fatigue properties. It also offers good corrosion resistance, good formability, and constancy in production.


Glock magazines have a geometry that cause new springs to be quite stiff when first installed. If the magazine feels overly stiff, use a magazine loader to load the magazine to capacity and allow it to stay fully loaded for a few days. Alternatively, use a magazine loader to load and unload the magazine several times.


No mechanical device will last forever. The more hostile the environment the more often springs and other components must be inspected. In a marine environment even stainless steel springs can experience some corrosion.

Magazine extensions:

White Sound Defense recommends using only Glock brand magazine extensions, as the magazine inserts in some other brands can foul springs resulting in failures to feed.