Thread: Magazine help needed - misfeeding

I'm having issues with both mags for my BRNO 581 misfeeding.
The one on the left (pictured) only occasionally misfeeds, but the one on the right jams every other shot, with the round pointing upwards and Jamming the action open.
There's a Cotter pin in a hole in the base of the better one, what does that do? And the tab at the top is bent.
What's the best way to clean them out, and is it just trial and error with the tabs to get them set right?
Cheers