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Glock Armorer
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678 Posts
Neither stock barrel will fit in your G23. (Standard G19 9mm barrels are smaller in diameter than .40 barrels and G17/G22 barrels have a different bottom locking lug.) To convert your G23 to 9mm you will need a special aftermarket conversion barrel. They are available from KKM, Lone Wolf, and several other internet dealers.

I have a KKM barrel that feeds 100% in my G23 (with 9mm magazines). I recommend them highly.
 
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