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The PMAG 30 AR 300 B's distinct rib design and smoother upper-half texture provides the shooter a distinct visual and tactile difference from any other PMAG Dedicated, purpose-designed magazine for rifles chambered in 300 Blackout Optimized internal geometry accommodates the wide variety of bullet profiles used in 300 Blackout cartridges Carries forward the physical and performance features of the rest of the GEN M3 line