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This has been discussed many times. It is not FMJ only. With a Glock barrel you need a jacketed projectile since glock barrels do not utilize traditional land and groove rifling. Hollow points are fine in Glock barrels. (as they are used in every LEO weapon)

I have shot lead through my glocks but they have aftermarket barrels. I also make sure they are clean all the time.
 

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Glockin’ since 1993
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Lead builds up on polygonal rifling. I think it depends on the amount of antimony in the lead(hardness). I had an issue in an Uzi which has the same rifling as the Glock. There are videos of guys shooting lots of lead through their Glocks. I think it would be better to be safe than sorry and I would run jacketed rounds.
 

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And since lead bullets are cheaper, and therefore bare lead ammo is cheaper, than regular jacketted (FMJ/TMJ/BEB/JHP) bullets and ammo, many shooters prefer lead ammo for cost for range sessions.

A way around this is to purchase an aftermarket barrel (such as a Lone Wolf, KKM, or any of the others) that have the traditional grooves and landings, and have no issues with lead ammo (but still need periodic cleaning). In fact, a larger caliber Glock (say a .40S&W) can be equipped with a barrel conversion to 9mm, providing the flexibility of shooting cheaper 9mm ammo, shooting lead ammo, shooting lead 9mm ammo, while still maintaining the ability to shoot .40S&W ammo.

No gunsmithing required, too!
 
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