Davidson Defense Hog Hunter 18-inch Mid-Length-Gas 1:24 .450 Bushmaster AR-15 Freefloat M-Lok Handguard Rifle Upper Build Kit

Hog Hunter 18-Inch Mid-Length-Gas 1-24 .450 Bushmaster AR-15 Freefloat M-LOK Handguard Rifle Upper Build Kit

This is an AR-15 upper build kit chambered in .450 Bushmaster, built around an 18-inch Sepal HBAR profile 4150 CMV steel barrel with a phosphate finish and a 1-24 twist rate specific to the .450 Bushmaster chambering. The Panhead billet upper receiver with a widened .458 ejection port cut anchors the front end with a profile purpose-built for the larger bore diameter of this chambering. The 15-inch freefloat extended quad rail M-LOK handguard in a G style clamp-on design wraps the barrel and gas system along the forend with full quad rail coverage and M-LOK slots integrated across the handguard body. BCG and charging handle are not included.

Key Features

• .450 Bushmaster chambering, 18-inch Sepal HBAR profile 4150 CMV steel barrel, phosphate finish
• 1-24 twist rate, 5-8x32 thread pitch
• Mid-length gas system with mid-length stainless steel gas tube
• Micro low-profile steel gas block, .750 inch
• Panhead billet upper receiver, .458 ejection port cut
• AR-15 ejection port door, rod and spring
• 15-inch freefloat extended quad rail M-LOK handguard, G style clamp-on, black, no anti-rotation tabs
• KAK .458 compensator, 5-8x32 thread pitch
• Black 5-8-inch crush washer

Perfect For

• AR-15 builders sourcing a .450 Bushmaster upper assembly without BCG or charging handle
• Shooters adding an 18-inch .450 Bushmaster upper to an existing lower with a compatible BCG and charging handle on hand
• Builders who want full quad rail coverage and M-LOK flexibility in one purpose-built .450 Bushmaster upper kit

Upper Receiver and Barrel

The Panhead billet upper receiver anchors the front end with a widened .458 ejection port cut, a purpose-built design feature for the larger case diameter of the .450 Bushmaster chambering that a standard AR-15 ejection port does not accommodate as cleanly. An AR-15 ejection port door, rod and spring are included as part of the upper. The 18-inch Sepal HBAR profile 4150 CMV steel barrel brings a phosphate finish and a 1-24 twist rate to the .450 Bushmaster chamber, threaded at 5-8x32, a thread pitch specific to this bore diameter. The mid-length stainless steel gas tube and micro low-profile steel gas block at .750 inch run a well-matched mid-length gas system along the barrel for the 18-inch profile, keeping the gas timing appropriate for this barrel and chambering combination.

Freefloat Extended Quad Rail M-LOK Handguard

The 15-inch freefloat extended quad rail M-LOK handguard clamps onto the upper receiver in a G style design and runs the full length of the forend with Picatinny rail coverage on all four sides and M-LOK slots integrated into the handguard body. The clamp-on attachment keeps the design straightforward with no anti-rotation tabs in the setup. The combination of quad rail sections and M-LOK slots across the handguard gives this build strong accessory flexibility at every position on the forend, making it a capable and well-equipped front end for a purpose-built .450 Bushmaster rifle platform.

Muzzle Device

The KAK .458 compensator threads onto the 5-8x32 muzzle end of the barrel, a thread pitch and caliber designation specific to the .450 Bushmaster bore diameter. The included black 5-8-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit. The KAK .458 compensator is a purpose-built muzzle device for this chambering and thread pitch combination.

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