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Hi Mark, because this is made by Pro Mag and is not a Star original. It will function the same. Stay safe & have a great day!

Because it is Not an OEM Star Magazine but a Reproduction made by ProMag.

Good morning to you!! The difference is that it's not an OEM magazine but a reproduction made by another manufacturer. The reproduction is made to direct specifications as the original and was approved by star for use in their firearms. Fit and function will be 💯. Hope this was helpful. Have a good rest of your day.

Hi Mark and welcome. Promag is a 3rd party manufacturer of aftermarket magazines and will not have the same overall features of the OEM magazines but will work in the corresponding firearm. Cheers, stay safe and enjoy!