This upper build kit combines a 4150 CrMoV Balmung barrel with a freefloat M-Lok handguard and a micro low profile gas block for a 350 Legend platform. The 16 inch barrel uses a carbine length gas system and a 1-16 twist rate, built on a 7075 T6 aluminum upper receiver with M4 feed ramps and a phosphate coated barrel finish. This kit covers the barrel, receiver, and handguard along with the forward assist, ejection port door, and muzzle hardware needed to round out the upper side of a 350 Legend build. BCG and charging handle are not included.
Key Features
Perfect For
The freefloat M-Lok handguard included in this kit does not contact the barrel along its length. This design keeps the handguard isolated from the receiver and barrel assembly. M-Lok slots run along the handguard for mounting lights, optics, and other accessories. The handguard is included as part of the upper side component set alongside the barrel and receiver.
This build includes a carbine length stainless steel gas tube paired with a micro low profile gas block. These two components make up the gas system included with this upper. The low profile design keeps the gas block compact along the barrel. Both pieces are included as part of the barreled upper assembly.
The barrel included in this kit is a 4150 CrMoV Balmung barrel with a 1-16 twist rate and a phosphate finish. It carries a government profile and a 5/8x24 threaded muzzle end. The twist rate and material are matched to the 350 Legend platform this upper is built around. This barrel is the core component of the included upper assembly.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included. This kit does not constitute a complete firearm.
Platform: AR-15
Caliber: .350 Legend
Color: Black
Barrel Length: 16-inch
Barrel Material: 4150 CrMoV
Barrel Finish: Phosphate
Barrel Profile: Government
Barrel Twist Rate: 1:16
Barrel Thread Pitch: 5/8x24
Upper Receiver Material: 7075 T6 Aluminum
Upper Receiver Finish: Anodized
Feed Ramp Style: M4
Gas Tube: Carbine Length Stainless Steel Gas Tube AR15 (Qty 1)
Gas Block Size: 0.750
Gas Block Style: Micro Low-Profile
Handguard Length: 15-inch
Handguard Style: M-Lok
Muzzle Device: AR-15/AR-10 .308 5/8x24 TPI GI Birdcage Flash Hider for .308 7.62x39 .300 Blackout (Qty 1)
Crush Washer: 5/8" Crush Washer - Black (Qty 1)
Forward Assist: Forward Assist Assembly AR-15 (Qty 1)
Ejection Port Door: AR-15 .223/5.56 Ejection Port Door, Rod and Spring
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