Davidson Defense Carapace 10.5-inch 1:10 9MM AR-9 Freefloat Quad-Rail Handguard Pistol Upper Build Kit

Carapace 10.5-Inch 1-10 9mm AR-9 Freefloat Quad-Rail Handguard Pistol Upper Build Kit

This is an AR-9 upper build kit chambered in 9mm, built around a Bear Creek Arsenal 10.5-inch 4150 steel barrel with a black nitride finish, a 1-10 twist rate, and a direct blowback system with no gas tube or gas block. The 7075-T6 aluminum AR-15 upper receiver with a Type III hardcoat anodized black finish and M4 feed ramps anchors the front end. The 10-inch freefloat quad rail handguard in black anodized 6061-T6 aluminum covers the forend with four full-length Picatinny rail sections. A 9mm A2 Birdcage flash hider in black at 1-2x36 closes out the muzzle end. BCG and charging handle are not included.

Key Features

• 9mm chambering, Bear Creek Arsenal 10.5-inch 4150 steel barrel, black nitride finish
• 1-10 twist rate, 1-2x36 thread pitch
• Direct blowback operation, no gas tube or gas block
• 7075-T6 aluminum AR-15 upper receiver, Type III hardcoat anodized black, M4 feed ramps
• 10-inch freefloat quad rail handguard, black anodized 6061-T6 aluminum, full-length Picatinny top rail with quad Picatinny rails, proprietary barrel nut
• 9mm A2 Birdcage flash hider, black, 1-2x36 thread pitch, black crush washer

Perfect For

• AR-9 pistol builders sourcing a 9mm upper assembly without BCG or charging handle
• Shooters adding a 10.5-inch 9mm AR-9 upper to an existing lower with a compatible 9mm blowback BCG and charging handle on hand
• Builders who want a Bear Creek Arsenal nitride barrel and 10-inch freefloat quad rail handguard with full four-sided Picatinny rail coverage in one compact 9mm upper kit

Upper Receiver and Barrel

The 7075-T6 aluminum AR-15 upper receiver with a Type III hardcoat anodized black finish and M4 feed ramps forms the core of the front end. The Bear Creek Arsenal 10.5-inch 4150 steel barrel brings a black nitride finish and a 1-10 twist rate to the 9mm chamber, threaded at 1-2x36. This upper operates on a direct blowback system, meaning there is no gas tube or gas block present or required on this upper. The 10-inch freefloat quad rail handguard in black anodized 6061-T6 aluminum surrounds the barrel along the forend with four full-length Picatinny rail sections running along the top, bottom, and both sides of the handguard body for optics and accessory mounting across all four rail positions. The handguard uses a proprietary barrel nut for attachment.

Muzzle Device

The 9mm A2 Birdcage flash hider in black threads onto the 1-2x36 muzzle end of the barrel. The included black crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit.

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