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Kurt, these are GSG 522 Magazines. https://www.budsgunshop.com/catalog/product_info.php/products_id/77659/promag+gsm-a1+gsg-5+magazine+22rd+22lr+black+polymer

Kurt - I highly recommend you avoid the ProMag magazine sold by Buds, and get the factory magazine from GunMag Warehouse. In a lifetime of shooting, I've had more problems with ProMag products than any other magazine on the market, period. Do yourself a favor and skip over the ProMag stuff.