BATHROBE SNIPER
Expert
I rotate all my mags out to prevent that. Seen that happen when I was deployed with our M4s and m16 mags.I ruined a surplus metal AK 30 rounder by leaving it loaded for about two months. It was a known good mag before that too. Apparently the spring pressure was too much for the soft junk metal in the feed lips, and the feed lips warped, causing jams at the next range trip, with just that one mag that had been left loaded