The Davidson Defense Cottonmouth 350 is a .350 Legend AR-15 upper build kit built around a 7075-T6 aluminum upper receiver with an anodized finish and M4 feed ramps. The kit includes a 16-inch M4 profile barrel in 4150 chrome moly vanadium steel with a phosphate finish, a 1:16 twist rate, and a 5/8x24 thread pitch. A freefloat M-Lok handguard in 6061-T6 aluminum, a 0.75 carbine gas block, and a GI Birdcage flash hider in manganese phosphate finish are included. BCG and charging handle are not included.
The Balmung barrel is a 16-inch M4 profile barrel in 4150 chrome moly vanadium steel with a phosphate finish. It is chambered in .350 Legend with a 1:16 twist rate and a 5/8x24 thread pitch. The carbine gas system runs a 0.75 gas block.
The upper receiver is 7075-T6 aluminum with an anodized finish and M4 feed ramps. The freefloat handguard is 6061-T6 aluminum and surrounds the barrel without contact, providing a clean mounting surface for M-Lok accessories along the handguard body.
The kit includes a GI Birdcage flash hider in manganese phosphate finish threaded at 5/8x24. This is the included muzzle device for this upper build kit.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.
Caliber: .350 Legend
Barrel Length: 16-inch
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Finish: Phosphate
Barrel Profile: M4
Barrel Twist Rate: 1:16
Barrel Thread Pitch: 5/8x24
Barrel Name: "Balmung" AR-15 16"
Gas System Length: Carbine
Gas Block Size: 0.75
Upper Receiver Material: 7075-T6 Aluminum
Upper Receiver Finish: Anodized
Upper Receiver Name: AR-15 Upper Receiver, M4 Feed ramps
Handguard Material: 6061 T6 Aluminum
Handguard Style: Freefloat
Muzzle Device: GI Birdcage Flash Hider
Muzzle Thread Pitch: 5/8x24
Muzzle Device Finish: Manganese Phosphate
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