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I will be getting a new Glock 23 GEN 5 and want to know if the chamber is fully supported on the GEN 5 models. I saw the Buffalo Bore +P 40 S&W ammo and would like to know if this is usable in the Glock 23 GEN 5. In addition, Underwood Ammunition has some extreme penetrator ammo that has no +P designation but I would think these 40 S&W ammos might not work in an unsupported chamber as well. Is there an official +P standard for 40 S&W? If I should upgrade the barrel, what would you recommend?
 

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Glockin’ since 1993
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Welcome to the forum from North Texas!
Technically there’s not supposed to be a +P loading for .40S&W but there are manufacturers that advertise such.
I believe Glock addressed the unsupported chamber years ago as I haven’t seen kabooms like 15 years ago.
 

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There is no +P for a 40 S&W. Unsupported chamber thing was addressed in the 90's IIRC.
Someone will be along to fill us with their infinite knowledge, but after using Underwood 40 hard cast for decades, and not seeing a Glock Smile in decades, I'm going with you'll be fine.
 
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What these two gents said.
 
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