The One Horse AR-15 Complete Upper in 5.56 NATO pairs a 16-inch SOCOM-profile barrel with a 15-inch M-LOK handguard (brand part no. CU01). One Horse builds it with a mid-length gas system, an A2 muzzle device, a nitride bolt carrier group and a charging handle, so it needs only a lower to complete a rifle. The handguard is a free-float design, and a full-length Picatinny rail on top is ready for optics. It suits builders who want a ready-to-run 5.56 upper for a range or general-purpose AR-15.

Key Specifications

• The chambering is 5.56 NATO, the standard military designation for AR-15 rifles.
• The barrel is 16 inches, a common carbine length for an AR-15 rifle.
• The barrel has a SOCOM profile, the contour listed for this upper.
• The gas system is mid-length, which gives smoother cycling than a carbine-length system.
• The muzzle device is an A2, a classic birdcage-style flash hider.
• The handguard is a 15-inch free-float M-LOK, with slots for lights and accessories.
• A full-length Picatinny rail on top gives plenty of room for optics.
• The bolt carrier group is nitride finished, for easy cleaning and smooth cycling.
• A charging handle is included, so the upper is complete.
• A clamp-on mounting system and a steel barrel nut with screws are listed with the upper.

Frequently Asked Questions

Is the bolt carrier group included? Yes. This is a complete upper with a nitride bolt carrier group and a charging handle.

What size is the handguard? The handguard is a 15-inch free-float M-LOK.

What gas system does it use? It uses a mid-length gas system.

Buy the One Horse AR-15 Complete Upper, 16-Inch, 5.56 NATO

A complete upper is the fastest route to a finished AR-15, and this one comes with the handguard, bolt carrier group and charging handle. Order it from our Lubbock, Texas gun shop for fast shipping, and see more AR-15 uppers while you are here.