| I am not sure I understand your question. A Glock is a pistol manufacturer not a caliber.
Generally, 9mm will be the cheaper of the self defence pistol rounds. A Glock in 9mm would be a good choice after he went to a training class. If he has not been around pistols, he really needs some training before buying one - especially a Glock (I love Glocks and own 4, but you need training before carrying one). It would be embarrassing to blow your own foot off - or worse.
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"Those who stand for nothing fall for anything."
- Alexander Hamilton
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