Davidson Defense Left-Handed Ronin Competition 10.5-inch Carbine-Gas 1:8 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit

Left-Handed Ronin Competition 10.5-Inch Carbine-Gas 1-8 5.56 NATO AR-15 Freefloat M-LOK Handguard Pistol Upper Build Kit

This is a left-handed AR-15 upper build kit chambered in 5.56 NATO, built around a Sandel 10.5-inch government profile cryogenically treated steel barrel with a phosphate finish, a 1-8 twist rate, and a carbine-length gas system. The Black Diamond Series left-handed slick side billet aluminum upper receiver with a black anodized finish anchors the front end with a left-hand ejection port and a clean slick side exterior that omits the forward assist and dust cover from the receiver body. The carbine-length stainless steel gas tube and micro low-profile steel gas block at .750 complete the gas system, and the ACE-20 Series 10-inch freefloat M-LOK handguard in black anodized aluminum covers the forend. An A2 GI Birdcage flash hider at 1-2x28 closes out the muzzle end. BCG and charging handle are not included.

Key Features

• 5.56 NATO chambering, Sandel 10.5-inch government profile cryogenically treated steel barrel, phosphate finish
• 1-8 twist rate, 1-2x28 thread pitch
• Carbine-length gas system with carbine-length stainless steel gas tube
• Micro low-profile steel gas block, .750
• Black Diamond Series left-handed slick side billet aluminum upper receiver, black anodized, no forward assist, no dust cover
• ACE-20 Series 10-inch freefloat M-LOK handguard, black anodized aluminum
• A2 GI Birdcage flash hider, 1-2x28 thread pitch
• Black 1-2-inch crush washer

Perfect For

• Left-handed AR-15 pistol builders sourcing a 5.56 NATO upper assembly without BCG or charging handle
• Shooters adding a left-handed 10.5-inch carbine-gas upper to an existing lower configured for left-hand operation with a left-handed BCG and charging handle on hand
• Left-handed builders who want a Sandel cryogenically treated barrel and purpose-built left-hand ejection slick side billet upper with an ACE-20 Series M-LOK handguard in one compact pistol-length upper kit

Upper Receiver and Barrel

The Black Diamond Series left-handed slick side billet aluminum upper receiver with a black anodized finish anchors the front end with a left-hand ejection port and a clean slick side exterior profile that omits both the forward assist and dust cover from the receiver body. The Sandel 10.5-inch government profile cryogenically treated steel barrel brings a phosphate finish and a 1-8 twist rate to the 5.56 NATO chamber, threaded at 1-2x28. The cryogenic treatment is applied to the barrel steel as a process that addresses stress and grain structure within the metal. The carbine-length stainless steel gas tube and micro low-profile steel gas block at .750 run a carbine-length gas system along the 10.5-inch barrel. The ACE-20 Series 10-inch freefloat M-LOK handguard in black anodized aluminum surrounds the barrel and gas system along the forend with M-LOK slots along the handguard body for accessory attachment across the full 10-inch length.

Muzzle Device

The A2 GI Birdcage flash hider threads onto the 1-2x28 muzzle end of the barrel. The included black 1-2-inch 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.