yes they are common except they want to much for them and standard M-43/44 mags. Anymore now I see RARE, when in fact they are common items, but you have guys who are not as astute. example: like me with trains, when my old engine died, I went to he next train show and replace it with a original model, I did not bat a eye to get a replacement engine.
guess there are guys out their like that in our hobby.
the people you need to thank are the fools who paid over $ 300 a mag, then more fools who bought mags for over $ 400 as the neckbeards kept raising the prices.