The barrels of Glock pistols use a different style of rifling, known as polygonal rifling. When shooting cast bullets, this rifling will get smeared with lead (known as "leading up"), and the pistol becomes unsafe to shoot.
TMJ (Total Metal Jacket) bullets should be safe in a Glock with polygonal rifling. It IS fully jacketed ammo. Glocks do not do well with cast lead bullets.
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