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No, they will not. The Glock 34 features a full-size frame, and the minimum capacity magazine it will accept is a 17-round magazine.
Glock 34 Magazines
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Frequently Asked Questions
Will a standard Glock 15-round fit the Glock 34?
What Glock models share magazine compatibility with my Glock 34 magazine?
Common Glock models that share magazine compatibility with the Glock 34 magazine include: Glock 17, 19, 26, 45, 47, and other double-stack 9mm models.