If your mag release is on the bottom of the stock then you have a Centerfeed. If you have a small round button in the side of the stock then you have a staggerfeed.
THIS LINK may help you identify your mag type.
If the stock is SF and you have a CF you can use shims or epoxy or ??? to fix the mag box for CF in the mag well of a SF stock. There are several threads here describing how to do this. Check the boards here for stocks or do a search and you should find the info you are looking for in more detail than I can recall at this moment.
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