A tiny weld on the lip, and a bit of filing on the catch and AK magazines work just fine in your Saiga.
So I've read. But in the big picture, who cares? I buy 5 mags at the higher price, but they (SGM) perform flawlessly. How many & how often do I have to buy mags? Once I get the number I want, I'm there.
I got some Promags made for the Saiga (cheaper than SGM) and they don't fit as well and I am having feed problems with them - so I'm back to the SGM. I want to know that my mags are 100% reliable. IOW, all of my practice is considered a dress rehearsal. No Rube Goldberging my firearms.