The One Horse HBAR Complete Upper (brand part no. OH-CU08) is a dependable 5.56 NATO complete upper receiver built for accuracy and smooth performance out of the box. One Horse builds this upper around a 16-inch HBAR-profile barrel with a 1:8 twist rate, delivering rigidity, heat resistance, and consistent shot-to-shot accuracy. The free-floated 15-inch M-LOK handguard provides solid accessory mounting and improved barrel stability, and a nitride-finished bolt carrier group ensures reliable cycling and long-lasting durability with minimal maintenance. A full-length Picatinny top rail offers ample real estate for optics and accessories, and the upper ships complete with a charging handle and a clamp-on system using a steel barrel nut and screws. Built in the U.S.A. and ready to pin onto any mil-spec AR-15 lower, this is a modular, ready-to-run upper. Among our AR15 uppers, the HBAR Complete Upper suits builders who want a genuinely complete, drop-on upper without sourcing individual components.

Key Specifications

• The chambering is 5.56 NATO.
• The barrel is 16 inches long, in an HBAR profile.
• The rate of twist is 1:8 inches.
• The handguard is a free-floated 15-inch M-LOK handguard.
• The bolt carrier group is nitride-finished for reliable cycling.
• A charging handle is included.
• The top rail is a full-length Picatinny rail.
• The barrel attaches via a clamp-on system with a steel barrel nut and screws.
• The upper is built in the U.S.A. and fits any mil-spec AR-15 lower.

Frequently Asked Questions

Does this upper come complete and ready to install? Yes, it ships as a complete upper with a nitride BCG and charging handle included, ready to pin onto any mil-spec AR-15 lower.

What twist rate does this barrel use? A 1:8 twist, which stabilizes a broad range of common 5.56/.223 bullet weights.

Is the handguard free-floating? Yes, the 15-inch M-LOK handguard is free-floated for improved barrel stability and accuracy.

Buy the One Horse HBAR Complete Upper

A genuinely complete, ready-to-run 5.56 NATO upper with real quality components, the HBAR Upper drops onto your lower and gets you to the range faster. Order it from our Lubbock, Texas gun shop for fast shipping.