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What are the lengths of the 22 round and 24 round 9mm Glock factory magazines?
2020 USPSA Open Division rules limit length to Maximum magazine length 6.742” (171.25mm) while ammunition capacity is unlimited.
 

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From an online search:

https://www.thefirearmblog.com/blog/2018/08/21/glock-now-selling-24-round-9mm-magazines/

"Thanks to TFB’s James Reeves, we have learned that the length of the magazine is 165mm (6.49″)."

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I have a 24-shot factory 9mm mag, but my precision measuring device won't handle stuff that big, and I don't know how they measure it (do they use a "box" like they do for other critical measurements; if it fits in the max-size box, then you're good to go?).

Using a carpenter's tape measure, measuring along the rear spine from floorplate to top-rear of feed lips gets me close to the reading quoted in the article, above. Checking from the back-bottom corner of the floorplate to the top-front corner of the magazine body (diagonal measurement), NOT including the tip of the follower, it comes in just about the max measurement you listed (a tiny bit less than 6.75").

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