Davidson Defense Blemished IX 8-inch 9MM Freefloat M-Lok Handguard Pistol Complete Upper Build

Blemished IX 8-Inch 9mm Freefloat M-LOK Handguard Pistol Complete Upper

This is a Blem complete AR-9 upper chambered in 9mm, built around an 8.3-inch medium profile 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 black anodized finish, M4 feed ramps, a standard AR-15 forward assist, and a standard AR-15 ejection port door anchors the front end. The 7-inch Blem freefloat M-LOK handguard with a full-length Picatinny top rail and integrated QD sling mounts covers the compact forend. An A2 GI Birdcage flash hider at 1-2x28 closes out the muzzle end. A 9mm black nitride bolt carrier group in 8620 alloy steel with an external extractor and Glock and Colt pattern magazine compatibility, and a Mil-Spec M4 charging handle complete the upper component set.

Key Features

• Blem handguard
• 9mm chambering, 8.3-inch medium profile steel barrel, black nitride finish
• 1-10 twist rate, 1-2x28 thread pitch
• Direct blowback operation, no gas tube or gas block
• 7075-T6 aluminum AR-15 upper receiver, black anodized, M4 feed ramps, standard AR-15 forward assist, standard AR-15 ejection port door
• 7-inch Blem freefloat M-LOK handguard, full-length Picatinny top rail, integrated QD sling mounts
• 9mm black nitride bolt carrier group, 8620 alloy steel, external extractor, Glock and Colt pattern magazine compatible
• Mil-Spec AR-15 M4 charging handle
• A2 GI Birdcage flash hider, 1-2x28 thread pitch

Perfect For

• AR-9 pistol builders pairing a complete 9mm upper with an existing lower
• Shooters adding an 8.3-inch 9mm upper to a compatible lower they already own
• Builders who want a purpose-built 9mm blowback BCG and charging handle included with a 7075-T6 aluminum upper receiver and Blem freefloat M-LOK handguard with integrated QD sling mounts at a reduced cost

Upper Receiver and Barrel

The 7075-T6 aluminum AR-15 upper receiver with a black anodized finish and M4 feed ramps forms the core of the front end, with a standard AR-15 forward assist and a standard AR-15 ejection port door built in. The 8.3-inch medium profile steel barrel brings a black nitride finish and a 1-10 twist rate to the 9mm chamber, threaded at 1-2x28. This upper operates on a direct blowback system, meaning there is no gas tube or gas block present or required on this upper. The 7-inch Blem freefloat M-LOK handguard surrounds the barrel along the compact forend with a full-length Picatinny top rail for optics and accessory mounting, integrated QD sling mounts for quick-detach sling attachment without additional hardware, and M-LOK slots along the remaining handguard surfaces for additional accessory attachment. The Blem designation applies to the handguard and refers to cosmetic imperfections that do not affect function.

Bolt Carrier Group and Charging Handle

The 9mm black nitride bolt carrier group is machined from 8620 alloy steel with a black nitride finish and features an external extractor design specific to the AR-9 blowback platform. It is compatible with both Glock and Colt pattern magazines, giving the build flexibility in magazine selection at the lower receiver level. The Mil-Spec M4 charging handle pairs with the BCG inside the upper receiver to complete the upper interior. These two components complete the upper component set alongside the upper assembly and barrel.

Muzzle Device

The A2 GI Birdcage flash hider threads onto the 1-2x28 muzzle end of the barrel and completes the muzzle hardware for this upper.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.