This upper build kit centers on a KAK Industry 11.5 inch 223 Wylde barrel with carbine gas and government profile. The 223 Wylde chamber accepts both 223 Remington and 5.56 NATO ammunition while maintaining tighter tolerances for improved accuracy potential. A 10 inch freefloat M Lok handguard provides full length accessory mounting, and the 7075 T6 aluminum upper receiver features M4 feed ramps for reliable feeding.
The 223 Wylde chamber offers crossover compatibility between 223 Remington and 5.56 NATO while maintaining match grade throat dimensions. The 1:8 twist rate stabilizes bullet weights from 55 grain to 77 grain effectively. Carbine length gas in an 11.5 inch barrel provides dependable cycling with manageable recoil impulse, making this combination work well for shooters who want compact length without sacrificing gas system reliability.
The 10 inch handguard extends nearly to the muzzle device, maximizing accessory mounting space without adding unnecessary weight. Freefloat design isolates the barrel from external pressure, helping maintain consistent point of impact when grips or accessories are added. In our experience, this length works well for lights, vertical grips, or hand stops while leaving the gas block fully covered and protected.
The government profile concentrates material where barrel stress is highest while reducing weight toward the muzzle. This distribution balances durability with handling characteristics in shorter barrels. Nitride finish penetrates the steel surface rather than coating it, providing internal and external corrosion resistance along with a hard wearing surface that holds up through extended use.
BCG and charging handle not included
Verify component compatibility before use
Inspect all components prior to use
Follow safe handling and manufacturer instructions
Ensure compliance with all applicable laws
Barrel: KAK Industry 11.5" .223 Wylde Carbine Gas Government Profile Barrel
Caliber: .223 Wylde
Barrel Length: 11.5-inch
Barrel Twist Rate: 1:8
Barrel Material: 4140
Barrel Finish: Nitride
Barrel Profile: Government
Barrel Thread Pitch: 1/2x28
Barrel Gas System Length: Carbine
Gas Block: Micro Low-Profile Gas Block
Gas Block Size: 0.750
Muzzle Device: AR-15 1/2x28 TPI GI Birdcage Flash Hider
Muzzle Thread Pitch: 1/2x28
Upper Receiver: AR-15 Upper Receiver, M4 Feed ramps
Upper Receiver Material: 7075-T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: M-Lok
Handguard Length: 10-inch
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