The One Horse 5.56 NATO 16" HBAR Complete Upper Receiver brings dependable performance to any mil-spec AR-15 lower. Built around a 16" heavy barrel with a 1:8 twist, this upper is designed for consistent accuracy and improved heat management during extended strings of fire. A 15" free-float M-Lok handguard and full-length Picatinny rail provide generous space for optics and accessories while keeping the barrel free from external pressure.

This complete upper arrives ready to pin on and run, including a nitride-finished bolt carrier group, charging handle, and threaded muzzle with A2-style flash hider. Chambered in 5.56 NATO, it is well suited for range use, training, and general-purpose carbine roles where reliability and repeatable precision matter. Thoughtful component selection and solid construction reflect One Horse’s focus on practical design and dependable craftsmanship.

Key Features:

• Manufacturer: One Horse
• Model: 5.56 NATO 16" HBAR Complete Upper Receiver
• Caliber: 5.56 NATO / .223 Remington
• Barrel Length: 16"
• Barrel Profile: HBAR
• Twist Rate: 1:8
• Gas System: Mid-Length
• Handguard: 15" Free-Float M-Lok
• Muzzle Device: A2 Flash Hider
• Upper Type: Complete AR-15 Upper Receiver