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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
Showing 1–12 of 58 resultsSorted by popularity
SALE 
Glock 17, 19, 26 9mm 33 Round Gen 5 Extended Magazine
566 reviews
Original price was: $48.00.$39.99Current price is: $39.99.
SALE 
Glock 17, 19, 26 9mm 24 Round Gen 5 Extended Magazine
Glock 17, 19, 26 9mm 24 Round Gen 5 Extended Magazine
70 reviews
Original price was: $48.00.$39.99Current price is: $39.99.
Out of stock
SALE 
Magpul PMAG 17 GL9 9mm 17 Round Magazine for Glock 17 Pistols (3 Pack)
Magpul PMAG 17 GL9 9mm 17 Round Magazine for Glock 17 Pistols (3 Pack)
272 reviews
Original price was: $44.99.$39.99Current price is: $39.99.
ETS 9mm 40 Round Extended Magazine for Glock 17, 19 Pistols
77 reviews
Price range: $13.99 through $22.99
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.