This upper build kit combines an 11.5-inch KAK Industry 4140 CrMoV barrel with a Trinity Force KMX 12-inch freefloat Keymod handguard, chambered in .223 Wylde. The kit includes an anodized 7075-T6 aluminum upper receiver with M4 feed ramps, micro low-profile gas block, carbine-length gas tube, steel flash can muzzle device, and forward assist assembly. BCG and charging handle are not included.
.223 Wylde offers a hybrid chamber design optimized for both .223 Remington and 5.56 NATO ammunition. The chamber dimensions provide enhanced accuracy with .223 Remington while maintaining full compatibility and safe pressure handling with 5.56 NATO loads.
The Trinity Force KMX 12-inch Keymod handguard provides freefloat design with 6061-T6 aluminum construction and modular Keymod slots for direct accessory mounting. The freefloat design isolates the barrel from external pressure, supporting accuracy.
The 11.5-inch KAK Industry barrel features 4140 CrMoV steel construction with nitride finish and government profile. The 1:8 twist rate stabilizes a wide range of bullet weights from 55 to 77 grains.
This kit uses a carbine-length gas system with a stainless gas tube and .750 micro low-profile gas block positioned beneath the handguard. The carbine-length configuration is optimized for the 11.5-inch barrel length.
This upper build kit is compatible with standard AR-15 lower receivers. All components use mil-spec dimensions and threading, including the 1/2x28 TPI muzzle threads matching the included steel flash can.
BCG and charging handle are not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.
Platform: AR-15
Caliber: .223 Wylde
Barrel Length: 11.5-inch
Barrel: KAK Industry 11.5" .223 Wylde Carbine Gas Government Profile Barrel
Barrel Twist Rate: 1:8
Barrel Material: 4140 CrMoV
Barrel Finish: Nitride
Barrel Profile: Government
Barrel Thread Pitch: 1/2x28
Barrel Gas System Length: Carbine
Gas Block Size: 0.750
Gas Block: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Gas Block Material: Steel
Gas Block Finish: Phosphate
Gas Block Profile: Low-Profile
Upper Receiver: AR-15 Upper Receiver
Upper Receiver Material: 7075-T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: KeyMod
Handguard: Trinity Force KMX Keymod Rail 12-inch Handguard
Muzzle Device: Steel Flash Can Design 1/2x28
Muzzle Device Thread Pitch: 1/2x28
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