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Glock 17

RetiredOC

Campaign Veteran
Joined
Dec 21, 2009
Messages
1,561
I have always heard of going from .40 to 9mm never the other way. Perhaps the ID of the hole in the slide on a 9mm Glock will not accept a .40 barrel. I think the 9mm barrels made for conversion in a .40 Glock have extra meat increasing the OD in order to match the slide.

Right. You can always convert down, you can never go UP.
 
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