That seems very odd since all of Glocks other magazines can be disaembled... Can you post up that video? Even if the mags that it comes with wont breakdown can you buy a few G30 Gen 4 mags and just replace those with the floor plates you want to add and keep the 10 rounders as backup? AFAIK Gen4 mags run just fine in Gen5 pistols, they do on my Gen5 G17