Add our extension kit to your Glock 31/33-round magazine and transform it into a giggle-worthy 41+1 round BIG stick. This is the same extension as our well-known 170mm +12 but it ships with a crazy-long machine-pistol spring. Normally we use Delrin for Glock mags, but we did these up in a beautiful blue-anodized aluminum. By default we'll send you the 9mm kit, but if you're using a .40, tell us! We can substitute in .40 parts that you can use on a 22-round .40 mag, achieving 30+1! (The 9mm and .40 extensions are different, so be sure to tell us whether you're shooting 9mm or .40/.357 Sig.) Magazine body not included.
Due to U.S. State Department restrictions, we cannot ship this part internationally.
NOTE: Because of a combination of factors, we build our basepads slightly "short" for best reliability. As a result, they will run properly with ammunition loaded to 1.125" overall or less. That's a typical length for 115- and 124-grain loads, but some (notably, Winchester 115 RN) will go out all the way to 1.160".
HINT: If your extension will take 35 rounds and then becomes unreliable (or sticks), check the length of your ammunition! Question? Give us a call and we can explain.
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
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glock 41+1 - Blue
Some minor beveling needed as per instructions.
41 + 1 base pads
Fit and finish are perfect. The only reason for 4 stars, you need to file down the follower to get it past the meeting point of mag to base. Customer service is EXCELLENT and they will talk you right thru it.