Magpul PMAG 30 AR 300 B

The Magpul PMAG 30 AR 300 B is a purpose-designed magazine optimized specifically for 300 AAC Blackout ammunition, addressing the unique feeding requirements of this increasingly popular cartridge. While standard 5.56 magazines can work with 300 Blackout, the dedicated 300 B magazine features internal geometry specifically engineered for the wider, shorter 300 Blackout case dimensions.

The magazine incorporates Magpul's proven Gen M3 technology including the four-way anti-tilt follower, but with modified feed geometry optimized for 300 Blackout's cartridge profile. This ensures reliable feeding with both supersonic and subsonic ammunition, including heavy subsonic loads that can be problematic in standard 5.56 magazines. The constant-curve internal geometry prevents bullet tip deformation and feeding issues common with heavier projectiles.

Visual identification is critical when running multiple calibers on the same platform, and Magpul addresses this with prominent 300 BLK markings molded into the magazine body. This helps prevent the dangerous mistake of loading 300 Blackout ammunition into a 5.56 chambered rifle. For shooters running 300 Blackout platforms, the PMAG 30 AR 300 B delivers the same proven reliability as standard PMAGs with optimization for this specific cartridge.