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This is a common occurrence in Glocks; I see it on a regular basis. The usual culprit is typically worn recoil and mag springs. So the first thing I do will change them but sometimes that won’t even fix the problem. I normally don’t see this happen with a new out of the box guns. However I did see it on a real regular basis when the Gen 4 first was released. Glock quickly got word and changed the recoil spring and that fixed the problem for the most part on the new Gen 4
Someone already stated the problem with a light on the Glock is it changes the way the frame flexes during recoil this is correct and the fix from Glock was they shortened the slide rail tabs. By shortening the tabs it also decreased the friction enough to allow the gun to function properly again. They also went from 10 coil magazine springs on the model 22 to an 11 coil spring.
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