Davidson Defense Sedna 18-inch Mid-Gas 1:10 .308 Win AR-10 Freefloat M-Lok Handguard Rifle Upper Build Kit

Davidson Defense Sedna AR-10 Upper Build Kit - 18-inch, .308 Win, Mid-Length Gas, M-Lok Freefloat Handguard

The Davidson Defense Sedna is a .308 Win AR-10 upper build kit built around a 7075-T6 aluminum high profile upper receiver with a black anodized finish. The kit includes a Scrubber 18-inch contour profile LR-308 barrel in 4150 chrome moly vanadium steel with a manganese phosphate finish, a 1:10 twist rate, and a 5/8x24 thread pitch, a freefloat M-Lok handguard in black 6061-T6 aluminum, a 0.75 mid-length gas block, and a GI Birdcage flash hider at 5/8x24. The high profile upper receiver and freefloat M-Lok handguard are sized for the AR-10 platform, forming the structural core of the upper assembly around the 18-inch Scrubber barrel. BCG and charging handle are not included.

Key Features

• 7075-T6 aluminum high profile upper receiver, black anodized finish
• Scrubber 18-inch contour profile LR-308 barrel, 4150 chrome moly vanadium, manganese phosphate finish
• .308 Win
• 1:10 twist rate
• 5/8x24 thread pitch
• Mid-length gas system
• 0.75 gas block
• Freefloat M-Lok handguard, 6061-T6 aluminum, black
• GI Birdcage flash hider, 5/8x24
• BCG not included
• Charging handle not included

Perfect For

• AR-10 builders sourcing a .308 Win upper build kit without BCG and charging handle in an 18-inch mid-length gas configuration
• Shooters pairing this upper kit with an existing AR-10 high profile pattern lower assembly and their own LR-308 BCG and charging handle
• Builders looking for an 18-inch .308 Win upper build kit with a freefloat M-Lok handguard and chrome moly vanadium barrel

Scrubber Barrel and Gas System

The Scrubber barrel is an 18-inch contour profile LR-308 unit in 4150 chrome moly vanadium steel with a manganese phosphate finish, chambered in .308 Win with a 1:10 twist rate and a 5/8x24 thread pitch. The mid-length gas system pairs with a 0.75 gas block to cover the gas regulation side of the upper. A GI Birdcage flash hider at 5/8x24 rounds out the muzzle end.

Upper Receiver and Handguard

The high profile upper receiver is 7075-T6 aluminum with a black anodized finish, sized for the AR-10 platform and forming the structural core of the upper assembly. The freefloat M-Lok handguard is 6061-T6 aluminum in black, surrounding the barrel without contact and providing M-Lok mounting positions for compatible accessories.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.