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I agree the glocks are tough, but the DAO is not for me
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Glocks are not DAO. They are a funky mix of SA and DA. You have to rack the slide to get the gun into half cock. The the trigger pull will fully cock the gun and fire it.
As for the OP, a lot of guns will support conversion barrels, but mostly you have to buy the .40, then convert to the 9mm. The SA XD, for example, is one, being the slide on the 9mm is some what thinner than on the 40.