The GST-9 is a modular frame that accepts two different grip extensions. One is shorter, resulting in a grip the same length as a Glock 19. The other is longer, configuring the grip to the same length as a Glock 17. Naturally, magazine compatibility changes when you swap these grips out. When in Glock 19 configuration, you can run Glock 19 magazines and larger. Ditto for the Glock 17 configuration of course.
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