This upper build kit combines a 10.5-inch Bear Creek 4150 CrMoV barrel with a 10-inch M-Lok freefloat handguard, chambered in .338 ARC. The kit includes an anodized 7075-T6 aluminum upper receiver with M4 feed ramps, micro low-profile gas block, pistol-length gas tube, GI birdcage flash hider, and forward assist assembly. BCG and charging handle are not included.
.338 ARC delivers substantial energy transfer and extended effective range in a compact platform. The caliber provides stopping power suitable for medium game applications while maintaining compatibility with AR-15 platform dimensions.
The 10-inch M-Lok freefloat handguard features 6061-T6 aluminum construction with M-Lok slots for modular accessory attachment. The freefloat design isolates the barrel from external pressure, supporting accuracy in compact upper configurations.
This kit uses a pistol-length gas system with a stainless gas tube and .750 micro low-profile gas block positioned beneath the handguard. The pistol-length configuration is optimized for the 10.5-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 5/8x24 TPI muzzle threads matching the included GI birdcage flash hider.
BCG and charging handle are not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.
Barrel Name: Bear Creek 10.5-inch .338 ARC Pistol Length H-Bar
Caliber: .338 ARC
Barrel Length: 10.5-inch
Barrel Material: 4150 CrMoV
Barrel Finish: Phosphate
Barrel Profile: HBAR
Barrel Twist Rate: 1:8
Barrel Thread Pitch: 5/8x24
Barrel Gas System Length: Pistol
Gas Block Name: Micro Low-Profile Gas Block
Gas Block Size: 0.750
Gas Block Material: Steel
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: 10" MLOK Freefloat
Upper Receiver Name: AR-15 Upper Receiver
Upper Receiver Material: 7075 T6 Aluminum
Upper Receiver Finish: Anodized
Muzzle Device: GI Birdcage Flash Hider
Muzzle Thread Pitch: 5/8x24
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