Magpul PMAG 30 AR 300 B GEN M3 Features The Magpul PMAG 30 AR 300 B GEN M3 is engineered specifically for .300 Blackout platforms featuring a distinct rib design and smoother upper-half texture that provides a clear visual and tactile difference from any other PMAG to mitigate the dangerous cross-loading risk of chambering a .300 BLK round in a 5.56x45mm rifle. This purpose-built design addresses one of the most serious ammunition management concerns facing .300 Blackout shooters who also run 5.56 platforms providing an additional safety layer through magazine differentiation that goes beyond labeling or color coding alone. The optimized internal geometry ensures reliable feeding of .300 Blackout cartridges through the full 30-round capacity without compromise. The PMAG 30 AR 300 B coyote polymer magazine incorporates all of Magpul s next-generation GEN M3 features including impact and crush-resistant polymer construction aggressive front and rear texture for a positive grip during reloads under any conditions an easily removable slim floor plate for cleaning and maintenance and a paint pen dot matrix for marking and identification in high-tempo shooting environments. At just 5 oz and 7.50 in length the PMAG 30 AR 300 B adds minimal weight to the loadout while delivering the capacity and reliability that Magpul PMAGs are trusted for worldwide. The coyote finish provides a visually distinct color that further aids in differentiating .300 Blackout magazines from standard 5.56 PMAGs at a glance. Magpul PMAG 30 AR 300 B GEN M3 Specifications Manufacturer: Magpul Model: PMAG 30 AR 300 B GEN M3 Series: GEN M3 Caliber: .300 Blackout Capacity: 30+1 Color: Coyote Material: Polymer Length: 7.50 Weight: 5 oz