One Horse 10.5" 5.56 NATO AR-15 Complete Upper with 10" M-LOK Handguard The One Horse OH-CU02 is a compact, fully assembled AR-15 upper built around a 10.5 inch 5.56 NATO barrel. It arrives with the bolt carrier group and charging handle installed, so you can pin it onto any mil-spec AR-15 lower receiver and get to the range. It is a strong fit for AR pistol and short-barreled rifle builds, home defense setups and anyone who wants a handy, maneuverable carbine-style upper. Every upper is assembled, headspaced and test fired before it ships, and it is made in the USA. 10.5" 4150 Medium-Profile Barrel The barrel is 4150 chrome-moly steel in a medium profile with a black nitride finish for corrosion and wear resistance. A 1:7 twist stabilizes a wide range of 5.56 NATO and .223 Remington bullet weights, including heavier projectiles. The muzzle is threaded 1/2x28 and fitted with an A2 flash hider, so you can swap in a compensator, brake or suppressor mount. Pistol-Length Gas System A direct-impingement, pistol-length gas system is matched to the 10.5 inch barrel for dependable cycling in a short package. 10" Free-Float M-LOK Handguard The 10 inch aluminum free-float handguard clamps to a steel barrel nut and never touches the barrel, which helps consistency. M-LOK slots give you room for lights, lasers, grips and sling mounts, and a full-length top rail lines up with the upper receiver for optics. Nitride BCG and Charging Handle Included An M16-cut bolt carrier group with a black nitride finish comes installed for smooth operation and easy cleanup, along with a standard charging handle. The upper receiver is built to mil-spec dimensions for drop-in fit. Good Uses for This Upper AR-15 pistol builds Short-barreled rifle builds (where legal and properly registered) Home defense and compact truck or ranch guns Adding a second caliber-matched upper to an existing AR-15 lower Suppressed shooting with a compatible 5.56 suppressor One Horse OH-CU02 Specifications Manufacturer: One Horse Part Number: OH-CU02 UPC: 850078799296 Caliber: 5.56 NATO / .223 Rem Barrel Length: 10.5 in. Barrel Profile: Medium Barrel Material: 4150 chrome-moly steel Barrel Finish: Black nitride Twist Rate: 1:7 Muzzle Thread: 1/2x28 Muzzle Device: A2 flash hider Gas System: Pistol length, direct impingement Handguard: 10 in. free-float M-LOK, aluminum Barrel Nut: Steel Bolt Carrier Group: M16 black nitride, installed Charging Handle: Standard, installed Fits: Mil-spec AR-15 lower receivers Weight: 54 oz. Country of Origin: USA Related Items Want more barrel? See the One Horse 16" 5.56 NATO complete upper. Frequently Asked Questions Will this upper fit my lower? Yes. It is built for any standard mil-spec AR-15 lower receiver. Does it come with a BCG and charging handle? Yes. An M16 black nitride bolt carrier group and a standard charging handle come installed. What ammunition does it shoot? It is chambered in 5.56 NATO and also fires .223 Remington. What is the muzzle thread pitch? The barrel is threaded 1/2x28, the standard thread for 5.56 AR-15 muzzle devices, and ships with an A2 flash hider. Do I need an FFL to buy a complete upper? No. A complete upper is not the serialized part of an AR-15, so it can ship directly to you in most areas. Check your state and local laws before ordering. Can I put this on a rifle lower with a stock? A 10.5 inch barrel on a lower with a shoulder stock makes a short-barreled rifle, which requires federal registration. Use it on a pistol lower, or complete the required paperwork before building an SBR. Is it test fired? Yes. Each upper is assembled, headspaced and test fired before it ships.