300 Blackout Uppers
High-Performance 300 Blackout Complete Uppers
Experience the ultimate in suppressed performance and tactical versatility with our selection of 300 Blackout complete uppers. Engineered to maximize the potential of the .300 AAC Blackout cartridge, these complete upper receivers offer seamless "plug-and-play" compatibility with your standard AR-15 lower. Whether you are building a compact home-defense pistol with an 8.5-inch barrel or a dedicated hunting rifle, the 300 BLK provides superior energy delivery and reliable cycling with both subsonic and supersonic ammunition.
Every 300 Blackout complete upper assembly in our inventory is optimized for the platform's unique gas requirements, typically featuring pistol-length gas systems to ensure flawless operation even when running a suppressor. By utilizing a 1:5 or 1:7 twist rate, our barrels provide the necessary stabilization for heavy 220gr subsonic projectiles while maintaining match-grade accuracy for lighter supersonic rounds. Upgrade your build today with a 300 BLK upper that balances a compact profile with 30-caliber knockdown power.
All AR15 Elite AR-15 uppers are American Made and machined by manufacturers of high quality, industry specific, mil-spec AR-15 components. Every upper we ship is individually checked for headspace using Manson go and no-go gauges prior to shipping to ensure safety and proper function.
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