Guy was standing firm that his Gen 3 glock was Gen 4....... Nope
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Well they are misinformed but with Glocks, it does work, it indexes off the extractor, not the best idea but it would work in a pinch atleast, and yes I have ran rounds through an Glock 20 I had and it ran 100% in the 10mm mags for the 45 rounds I ran through it.40's work in a 10mm guns, just like 38's work in 357 guns.