ONE HORSE 300BLK COMPLETE UPPER RECEIVER W/MEDIUM PISTOL BBL FOR AR-15

Build a compact, hard-hitting AR platform with this .300 Blackout complete upper receiver, designed for reliability, maneuverability, and close-quarters performance. Fully assembled and ready to install, this upper is an ideal solution for pistol or SBR configurations where compact size matters.

At the core is a 300 Blackout barrel, optimized for strong performance in shorter barrel lengths while maintaining excellent energy and versatility with a wide range of bullet weights. The compact design makes it well-suited for suppressed or unsuppressed setups.

The M-LOK free-float handguard provides a slim, lightweight profile while enhancing barrel stability for improved accuracy. With multiple attachment points, it offers flexibility for adding lights, grips, or other essential accessories.

A nitride bolt carrier group ensures smooth, reliable cycling with enhanced durability and corrosion resistance, while the included charging handle completes the package for true plug-and-play convenience.

Built for compatibility with standard mil-spec AR-15 lowers, this upper is ready to pin on and run right out of the box.

FEATURES

• .300 Blackout Barrel – Compact, powerful performance optimized for short platforms
• Short-Barrel Configuration – Ideal for AR pistols, SBRs, and suppressed applications
• M-LOK Free-Float Handguard – Lightweight and modular with improved barrel stability
• Nitride Bolt Carrier Group – Durable, corrosion-resistant, and low maintenance
• Compact & Maneuverable – Perfect for confined environments and fast handling
• Full-Length Picatinny Rail – Ready for optics and accessories
• Mil-Spec Compatibility – Fits standard AR-15 lower receivers
• Made in USA – Built with quality materials and dependable craftsmanship

WHAT’S INCLUDED

• Complete upper receiver assembly
• 7300 Blackout barrel
• M-LOK free-float handguard
• Nitride bolt carrier group (BCG)
• Charging handle
• Barrel nut and mounting hardware

SPECIFICATIONS

• Caliber: .300 AAC Blackout
• Gas System: Pistol-Length
• Rail: Picatinny top rail
• Compatibility: Mil-Spec AR-15 lowers
• Country of Origin: USA