New Saiga 12 owner here, and I picked up a couple of ProMag 10 round magazines.
Like most, I am experiencing where the back of the magazine doesn't click into the release catch. I have read that they come with instructions but my magazines didn't come with any.
I emailed ProMag, and here is the reply that I received...
Okay, I tried pulling the magazine in tight, but that didn't work. So, if I am reading this correctly...I need to file the area just under the magazine catch on the back of the magazine? Like...increase the space between the bottom of the rear magazine catch