I noticed something about some of the magazines I'm currently using for my G23.  In the pictures from left to right the followers have a #8 (15 rd G22 magazine), #9, and #6 on them.  They are all different in subtle ways.  In the last picture the #9 and # 6 magazines are cut out different at the top.  What really has me confused, and I just noticed also, of all  three of the magazines the #6 follower mag shoots out of my gun way faster when I hit the release. Is it because of the follower?  I'd love for all my magazines to have this extra drop free power!

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Looks like the front end sticks up higher than that of the newer one.  That's probably why.  I didn't know they made it to #9 now.

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Just surprised to see so many different iterations of a 40 SW Glock magazine.  Guess no one else has experienced this?

I have a few like that. No clue why they make so many variations. They also have 2 different ways to attach the spring to the follower, and the springs/followers are not compatible with each other. From experience I can tell you I have never noticed a difference in function. I can see how if you were ejecting empty mags the one might eject a little harder, but if your mags empty it should be at slidelock.

Thanks for the insight.  Up until a few days ago I had no idea there were so many iterations of Glock mags!