[USArmyE4]

I got a Glock 27 to replace the Glock 33, can i use my same G33 Mags with the G27?

Because the .357sig is just a necked down .40S&W.... Am I making a big mistake?

I did notice that the openings at the top of the mags were just a little bit different and the notch where the primer of the cartridge can be seen is shaped a little different as well.