I have five S308 recently purchased from Dinzag.
When I first got them, I had to break sharp edges and points on all five magazines.
Last night I was practicing inserting a magazine in the dark. Damned thing wouldn't go in. Kept binding forward or backward. (Gosh, does this indicate a radius issue?)
Now I'm an AR guy, so I figured I was at the steep part of the learning curve. I grabbed an original Saiga and it went right in. In the dark. Over and over. I grabbed an American made plastic mag and it also went right in on each attempt.
I turned on the light and started to check out the magazine.
The first thing I noticed is these haven't been heat treated. The steel is soft, and my practice caused the magazine to deform at the back part of the feed lips and both the front and back latch lips. Closer examination and comparing it to an original Saiga magazine also revealed that the back part of the magazine just below the feed lips was bulging outward a couple of thousandths.
I took a file to the feed lips to remove some metal (the radius problem). I also smoothed the latch lips. A light hammer removed the bulge at the back of the magazine just below the feed lips.
I performed the same modifications to a second CSSpec magazine. Both now insert flawlessly. They also cycle rounds by hand, but that wasn't an issue before. I'll modify the remaining three tonight.
I really, really hope someone else realizes there's a market hungry for Saiga 308 magazines and starts to produce. As it stands, the only reliable magazines for my S308 are the OEM. The other two brands have major issues, and I won't hesitate to call each an amateurish attempt that should have had the design properly peer reviewed and tested before coming to market.
Sorry to sound harsh, but at $50 each for the steel and $40 each for the plastic, I have yet to get my money's worth.