I have a Gen 4 G22 and wanted to get some additional Gen 4 mags for it, the ones with the double magazine-release notch. Various suppliers are advertising that they have Gen 4 mags available, but I just spoke with a sales supervisor at Glock this morning, and he says that the only Gen 4 mags they have produced are the ones shipped with the pistols, three per gun. No Gen 4 mags have been produced or sold to anyone, retail or wholesale, aside from the ones provided with the G22 itself. They do not even have a separate part number for G22 Gen 4 mags. Any dealer advertising these--unless they are being sold with the pistols themselves--is either confused or deliberately misleading the customer. At this point, Glock cannot give a date when these Gen 4 mags will be available, although they fully expect that they will be. Unfortunately, I did not ask if this also applies to the G17. Caveat emptor.