I bought some Bulgarian waffle mags for $9.95 from K-Var. Others have mentioned that they thought they were all plastic. The ones I got appear to be plastic molded around a thin metal body. You can see metal on the inside near the feed lips and the notch on the front of the mag is metal as well.
Mags functioned fine in this SKS Sporter. They fit very snugly. Mag changes are a little clumsy, but I'm getting better at angling them in and locking them in place. I've never really played with an AK so I can't compare the SKS Sporter to an AK in terms of how the mags work. It is a conversion, but overall seems to work OK. I don't really need to be able to change the mags quickly anyway. It is just a fun plinker.
Mags functioned fine in this SKS Sporter. They fit very snugly. Mag changes are a little clumsy, but I'm getting better at angling them in and locking them in place. I've never really played with an AK so I can't compare the SKS Sporter to an AK in terms of how the mags work. It is a conversion, but overall seems to work OK. I don't really need to be able to change the mags quickly anyway. It is just a fun plinker.