The Davidson Defense Glassbreaker 18-inch AR-15 .450 Bushmaster Rifle Complete Upper Build is engineered for durability and precision, making it ideal for gunsmiths who value performance. This upper features an 18-inch "Sepal" HBAR barrel constructed from 4150 Chrome Moly Vanadium steel, with a 1:24 twist rate and phosphate finish. The mid-length gas system ensures reliable cycling, while the 5/8x32 thread pitch allows for mounting a variety of muzzle devices.
The 15-inch KeyMod handguard, made from lightweight 6061-T6 aluminum, offers ample rail space for accessories without adding unnecessary weight. The .458 SOCOM / .450 Bushmaster bolt carrier group is crafted from 9310 alloy steel and finished with nitride for enhanced wear resistance. The stripped upper receiver is built from robust 7075-T6 forged aluminum with an anodized black finish, designed for large ejection ports. Complete with a mil-spec AR-15 M4 charging handle, this upper build delivers performance that aligns with the values of freedom.
Caliber: .450 Bushmaster
Barrel Name: "Sepal" 18" .450 Bushmaster 1-24T 4150 CMV Phosphate Steel HBAR
Barrel Length: 18 inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Twist Rate: 1:24
Barrel Profile: HBAR
Barrel Finish: Phosphate
Barrel Thread Pitch: 5/8x32
Barrel Gas System Length: Mid-Length
Gas Block Size: 0.75
Handguard Style: KeyMod
Handguard Material: 6061-T6 Aluminum
Handguard Length: 15 inches
Bolt Carrier Name: .458 SOCOM / .450 Bushmaster Bolt Carrier Group
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Upper Receiver Name: Stripped Upper Receiver .450/.458, Large Ejection Port
Upper Receiver Material: 7075-T6 forged aluminum
Upper Receiver Finish: Anodized Black
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
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