300BLK 16" SOCOM Pistol BBL Complete Upper Receiver for AR15

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

Upgrade your rifle with a versatile 16" .300 Blackout complete upper receiver built for reliable performance, modular flexibility, and consistent accuracy. Designed to handle a wide range of shooting applications, this upper performs effectively with both subsonic and supersonic loads.

At the core is a 16" .300 Blackout barrel paired with a pistol-length gas system, delivering reliable cycling—especially when running subsonic ammunition or suppressed setups. This configuration enhances function across various loads while maintaining smooth operation.

The 15" free-float M-LOK handguard improves barrel stability for increased accuracy while offering ample space for mounting lights, grips, and accessories. Its slim, lightweight design ensures excellent handling without sacrificing durability.

A nitride bolt carrier group provides dependable cycling with added corrosion resistance and long service life. Combined with a full-length Picatinny rail, this upper is ready for optics and accessories right out of the box.

Fully assembled and compatible with standard mil-spec AR-15 lowers, this upper is designed for quick installation and immediate use.

FEATURES

• 16" .300 Blackout Barrel – Optimized for both subsonic and supersonic ammunition
• Pistol-Length Gas System – Reliable function, especially for suppressed and subsonic use
• 15" M-LOK Free-Float Handguard – Enhanced accuracy with modular accessory mounting
• Nitride Bolt Carrier Group – Durable, corrosion-resistant, and low maintenance
• Full-Length Picatinny Rail – Ready for optics and attachments
• Versatile Performance – Ideal for range, hunting, and suppressed setups
• Mil-Spec Compatibility – Fits standard AR-15 lower receivers
• Made in USA – Built with quality materials and craftsmanship

WHAT’S INCLUDED

• Complete upper receiver assembly
• 16" .300 Blackout barrel
• 15" M-LOK free-float handguard
• Nitride bolt carrier group (BCG)
• Charging handle
• Steel barrel nut and mounting hardware

SPECIFICATIONS

• Caliber: .300 AAC Blackout
• Barrel Length: 16"
• Gas System: Pistol-Length
• Handguard Length: 15"
• Muzzle Thread: 5/8x24
• Rail: Picatinny top rail
• Compatibility: Mil-Spec AR-15 lowers
• Country of Origin: USA