The .40S&W slide is a little heavier (that area missing the milling on the front of the slide).
They did this so that thye could use the same recoil spring assemblies for both guns. Why? I have no idea, it seems like it would be cheaper to have one slide made and buy two different spring weights, but hey what do I know?
They did this so that thye could use the same recoil spring assemblies for both guns. Why? I have no idea, it seems like it would be cheaper to have one slide made and buy two different spring weights, but hey what do I know?
