300 Blackout’s (sometimes written as 300 BLK or 300 BLKOUT) a versatile rifle cartridge designed for AR 15 platforms. Optimized for both suppressed and unsuppressed use, especially in short barreled firearms. While not a manufacturer, many companies produce 300 Blackout specific parts, including barrels, upper receivers, bolt carrier groups, magazines, and complete rifles or pistols. These components are compatible with standard AR 15 lower receivers. Making 300 Blackout a popular choice for shooters and builders seeking reliable, hard hitting performance for hunting, home defense, and tactical applications.
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