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The KRISS MagEx Extended Magazine holds 25 rounds of .45ACP to feed into your KRISS Vector or Glock hand gun. This video will take you step by step on how to convert the your G21 magazine from a 13 round capacity magazine to a 25+ round capacity magazine.
To purchase the MagEx Kit to convert your G21 mags, see the following link:
https://kriss-usa.com/store/magazines/kriss-magex-25-rd-glock-21-magazine-kit
Or, if you prefer to purchase a complete KRISS MagEx Magazine:
https://kriss-usa.com/store/magazines/kriss-magex-25-rd-glock-21-magazine-173
For more accessories and spare parts visit www.kriss-usa.com/store