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Kriss Magazine Extension Kit Converts GLOCK 21 Magazines to 30 Rounds ACMEK0800101

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The Kriss GLOCK 21, 21SF magazine extension kit will add +17 rounds to your factory GLOCK magazine. The extension consists of a sleeve, base plate and extended magazine spring. The factory follower is used with this extension kit. The back of the base pad extension has round count witness holes to keep track of your ammo. This kit works best with newer magazine bodies, pre ban magazines may have reliability issues.

Specifications and Features:
Increased Capacity, 17 Additional Rounds
Secure Two Piece Extension
Extra Power Spring 
Total number of Reviews: 2

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5.0 5
"Easy to assemble. Little difficult to the the 30th round in, but with the use of a UpLULA, was able to top it off relatively easily. Functioned like a dream. No feed failures or issues at all. Will look into expanding my current inventory of G21 mags to include this extension. Next thing to try is a A&G magazine spacer to see if it fits and works."
2.0 5
"Not very reliable but good for fun at the range."