The Glassbreaker 18-inch AR-15 .450 Bushmaster Rifle Upper Build Kit from Davidson Defense is a robust assembly designed for optimal performance and straightforward installation, ideal for custom builds. It features an 18-inch "Sepal" barrel made from 4150 Chrome Moly Vanadium with a 1:24 twist rate, finished in phosphate for durability. The upper receiver is crafted from machined 7075-T6 forged aluminum with an anodized black finish, incorporating a large ejection port specifically designed for .450/.458 calibers.
The kit also includes a micro low-profile gas block and a mid-length gas system, paired with a KAK .458 compensator for improved recoil management. The handguard, constructed from 6061-T6 aluminum with a KeyMod style, enhances accessory attachment options. This upper build kit is tailored for gunsmiths seeking precision and reliability in their AR-15 platform rifles, facilitating the pursuit of freedom through custom firearms.
Caliber: .450 Bushmaster
Platform: AR-15
Barrel Information:
Barrel Name: "Sepal" 18" .450 Bushmaster
Barrel Length: 18 inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Twist Rate: 1:24T
Barrel Finish: Phosphate
Barrel Profile: H-Bar
Barrel Thread Pitch: 5/8x32
Barrel Gas System Length: Mid-Length
Gas Block Information:
Gas Block Size: 0.75
Gas Block Name: Micro Low-Profile Gas Block for .750 O.D Barrel Steel
Upper Receiver Information:
Upper Receiver Name: Stripped Upper Receiver .450/.458, Large Ejection Port
Upper Receiver Material: Machined from 7075-T6 forged aluminum
Upper Receiver Finish: Anodized Black
Handguard Information:
Handguard Material: 6061-T6 Aluminum
Handguard Style: KeyMod
Muzzle Device Information:
Muzzle Device: KAK .458 Compensator
Muzzle Thread Pitch: 5/8x32
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