About the Magpul PMAG 30 AR/M4 GEN M3The Magpul 30 AR/M4 GEN M3 Window is a 30-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons that features transparent windows to allow visual identification of approximate number of rounds remaining.
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I ordered some magazines from this website and they took really good care of my order.