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

Hog Hunter 18-Inch Mid-Length-Gas 1-24 .450 Bushmaster AR-15 M-LOK Rifle Complete Upper

This is a complete AR-15 upper 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. A .458 SOCOM and .450 Bushmaster compatible bolt carrier group and an M4 Mil-Spec charging handle complete the upper component set.

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 assembly
• 15-inch freefloat extended quad rail M-LOK handguard, G style clamp-on, black, no anti-rotation tabs
• .458 SOCOM and .450 Bushmaster compatible bolt carrier group
• AR-15 M4 Mil-Spec charging handle
• KAK .458 compensator, 5-8x32 thread pitch
• Black 5-8-inch crush washer

Perfect For

• AR-15 builders pairing a complete .450 Bushmaster upper with an existing lower
• Shooters adding an 18-inch .450 Bushmaster upper to an AR-15 lower they already own
• Builders who want a BCG and charging handle included with a purpose-built .450 Bushmaster upper assembly featuring full quad rail coverage

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 assembly is 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.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is compatible with both .458 SOCOM and .450 Bushmaster, addressing the platform-specific BCG requirement for this bore diameter that a standard AR-15 bolt carrier group does not meet. The M4 Mil-Spec charging handle pairs with the BCG inside the upper receiver to complete the upper interior. Together these two components finish the upper side with a fully matched and chambering-specific component set that gives this complete upper everything it needs to drop onto a lower.

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 upper. The KAK .458 compensator is a purpose-built muzzle device for this chambering and thread pitch combination.

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