WMD Guns 300 Blackout Complete Upper Assembly – 16" Barrel, AR-15 Platform

The WMD Guns 300 Blackout Complete Upper Assembly delivers reliable performance in a versatile chambering suited for both subsonic and supersonic applications. Built for standard AR-15 lowers, this 16-inch upper configuration provides the ballistic efficiency 300 BLK is known for while maintaining legal compliance for rifle-length firearms. The 16-inch barrel optimizes velocity for supersonic loads while still functioning effectively with subsonic ammunition when paired with a suppressor.

WMD Guns applies their proprietary NiB-X nickel boron coating to critical components, offering enhanced corrosion resistance and reduced friction compared to standard phosphate finishes. This complete upper assembly arrives ready to install on any mil-spec AR-15 lower receiver. Confirm headspace and function-test with your specific lower and bolt carrier group before live fire. As with any 300 Blackout firearm, exercise strict ammunition discipline—chambering 300 BLK in a 5.56 upper or vice versa can cause catastrophic failure.

• Caliber: 300 Blackout
• Type: Complete Upper Assembly
• Compatible Lower: AR-15 (mil-spec)
• Barrel Length: 16 inches
• Material: Forged aluminum receiver, steel barrel
• Finish: NiB-X nickel boron coating on key components
• Includes: Upper receiver, barrel, handguard, gas system, charging handle (confirm specific components with manufacturer)
• Installation: Attaches to mil-spec AR-15 lower; verify headspace before use