The fact that your followers are marked .357/10 and "2" is strange, that sounds more like a 10-round magazine designation for followers.
From the latest Glock parts list:
Quote:
SP 01593-2 Magazine Follower - .357 9-rd, 11-rd, 13-rd, & 15-rd mags only - current follower is marked .357 & 2
SP 01009 Magazine Follower - .357 10-rd G31-G32 mags only - marked .357/10 & 1
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Perhaps there's a new 10-round follower marked ".357/10 2" instead of ".357/10 1" that Glock accidentally put into your magazines. Still I would try different ammo first.
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