On my just finished AR build. I bought one 30rd Magpul pmag and one 20rd Promag. I haven't shot it yet but so far the pmag seems fine. Drops free, holds back the bolt, and doesn't wiggle.
The promag I just bought at Academy tonight is going back. I don't know if I got a defective one but it fits tight, doesn't drop, and worse the bolt binds when I try charging it. Last promag I will ever buy.
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