SLR Rifleworks Extended Magazine Spring for GLOCK 21

Manufactured by SLR Rifleworks
Manufactured by SLR Rifleworks
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NOTE: Limit 10 per household. Quantities exceeding 10 will not allow checkout.



A few extra rounds can make a difference but without the proper spring a magazine extension can impact reliability. SLR Rifleworks extended magazine spring features 11.5 coils, upping the spring's pressure a full 10% stronger than a factory length spring. Keep your mags functioning in top shape with the extended magazine spring for the SLR Rifleworks +4 Glock 21 magazine extension.


  • Stronger than factory spring
  • Designed for SLR Rifleworks Glock 21 +4 magazine extension

SLR Rifleworks is a firearms manufacturer based in central Florida that specializes in bringing new, innovative parts to the AR-15 platform. SLR has even expanded into the AK-47 and Glock platforms with various components like stocks, muzzle devices, and magazine wells.
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BrandSLR Rifleworks
PlatformGlock Magazines

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