SLR Rifleworks Extended Magazine Spring for GLOCK 21

Manufactured by SLR Rifleworks
Manufactured by SLR Rifleworks
(0) No Reviews yet

In Stock

Standard orders will ship out same day if ordered by 3:30pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



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.
See More


BrandSLR Rifleworks
PlatformGlock Magazines

Ratings & Reviews

No reviews available

Be the first to Write a Review