Davidson Defense Ronin Competition 8-inch 9MM Freefloat M-Lok Handguard Pistol Complete Upper Build

Ronin Competition 8-Inch 9mm Freefloat M-LOK Handguard Pistol Complete Upper

This is a complete AR-9 upper chambered in 9mm, built around an 8.3-inch medium profile steel barrel with a nitride finish, a 1-10 twist rate, and a direct blowback system with no gas tube or gas block. The 6061 billet pistol caliber AR-15 upper receiver with a black finish anchors the front end. The ACE-20 Series 7-inch freefloat M-LOK handguard in black covers the compact forend. An A2 GI Birdcage flash hider at 1-2x28 closes out the muzzle end. A 9mm 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

• 9mm chambering, 8.3-inch medium profile steel barrel, nitride finish
• 1-10 twist rate, 1-2x28 thread pitch
• Direct blowback operation, no gas tube or gas block
• 6061 billet pistol caliber AR-15 upper receiver, black
• ACE-20 Series 7-inch freefloat M-LOK handguard, black
• 9mm 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, black crush washer

Perfect For

• AR-9 pistol builders pairing a complete 9mm upper with an existing lower
• Shooters adding a compact 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 nitride medium profile barrel and ACE-20 Series M-LOK handguard in one complete AR-9 upper assembly

Upper Receiver and Barrel

The 6061 billet pistol caliber AR-15 upper receiver with a black finish forms the core of the front end for the AR-9 platform. The 8.3-inch medium profile steel barrel brings a 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 ACE-20 Series 7-inch freefloat M-LOK handguard in black surrounds the barrel along the compact forend with M-LOK slots across the handguard surfaces for accessory attachment and optics mounting.

Bolt Carrier Group and Charging Handle

The 9mm nitride bolt carrier group is machined from 8620 alloy steel with a 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. The included black crush washer seats at the barrel shoulder and completes the muzzle hardware for this upper.

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