Davidson Defense Hi-10 5.5-inch 1:16 10MM AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit

Hi-10 5.5-Inch 1-16 10mm AR-15 Freefloat M-LOK Handguard Pistol Upper Build Kit

This is an AR-15 upper build kit chambered in 10mm Auto, built around a 5.5-inch PCC profile steel barrel with a black nitride finish, a 1-16 twist rate, and a 5-8x24 thread pitch. The billet AR-15 pistol caliber upper receiver anchors the front end with a design purpose-built for pistol caliber AR platform use. The 4.2-inch freefloat M-LOK handguard in 7075-T6 aluminum with an integrated hand stop keeps the front end compact and purposeful on this pistol-length build. BCG and charging handle are not included.

Key Features

• 10mm Auto chambering, 5.5-inch PCC profile steel barrel, black nitride finish
• 1-16 twist rate, 5-8x24 thread pitch, direct blowback
• Billet AR-15 pistol caliber upper receiver
• 4.2-inch freefloat M-LOK handguard, 7075-T6 aluminum, black, integrated hand stop
• Pershing Steel flash can, 5-8x24 thread pitch
• Black 5-8-inch crush washer

Perfect For

• AR-15 pistol builders sourcing a 10mm upper assembly without BCG or charging handle
• Shooters adding a 10mm upper to an existing lower with a compatible bolt assembly and charging handle on hand
• Builders who want a compact pistol-length 10mm upper kit as the front end foundation of a blowback AR pistol build

Upper Receiver and Barrel

The billet AR-15 pistol caliber upper receiver is the correct upper receiver choice for the pistol caliber AR platform, addressing the dimensional requirements of pistol caliber blowback operation that differ from a standard AR-15 upper receiver. The 5.5-inch PCC profile steel barrel brings a black nitride finish and a 1-16 twist rate to the 10mm Auto chamber, threaded at 5-8x24. The PCC profile is specific to pistol caliber carbine builds and keeps the barrel contour lean and well-suited to the compact pistol-length layout of this upper kit. The direct blowback design of this barrel is the operating system for the 10mm Auto chambering on this platform, and the upper receiver and barrel work together as the core front end of a blowback AR pistol build.

Freefloat M-LOK Handguard

The 4.2-inch freefloat M-LOK handguard in 7075-T6 aluminum wraps the barrel from the upper receiver along the forend with an integrated hand stop built into the handguard body, giving the builder a natural front end grip reference on this compact upper without adding a separate accessory. M-LOK slots run along the handguard for accessory attachment. At 4.2 inches the handguard pairs closely with the 5.5-inch barrel, keeping the overall front end profile tight and purposeful for a pistol-length 10mm blowback build.

Muzzle Device

The Pershing Steel flash can threads onto the 5-8x24 muzzle end of the barrel and closes out the front of the upper with a flash can profile at the muzzle end. The included black 5-8-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit. The 5-8x24 thread pitch is standard for 10mm and compatible caliber ranges on the AR pistol platform.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.