.450 Bushmaster 18" AR-15 Upper Assembly – 15" Diamond Cut M-LOK, A2 Flash Hider
| Brand: | Moriarti Armaments |
| Product Code: | MAR-450-18-A2 |
| Availability: | In Stock |
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$279.95
- $449.95
.450 Bushmaster
The Moriarti .450 Bushmaster 18" AR-15 Upper Assembly features an 18-inch heavy-profile barrel manufactured from 4150 Chrome Moly Vanadium steel, a 15-inch black Diamond Cut M-LOK free-float handguard, and a .450-caliber A2-style flash hider.
The barrel features a Parkerized finish, 1:24 twist rate, single feed ramp, and mid-length gas system. Its heavy, non-fluted construction uses a .750-inch gas block journal and 5/8×32 muzzle threads.
The assembly features a black forged 7075 aluminum flat-top upper receiver with an enlarged ejection port designed for .450 Bushmaster and .458 SOCOM cartridges. The 15-inch Diamond Cut M-LOK handguard features geometric openings, M-LOK accessory mounting positions, and a continuous Picatinny top rail.
The bolt carrier group and charging handle are available as optional add-ons.
Key Features
Caliber: .450 Bushmaster
Barrel: 18" heavy-profile, non-fluted
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Finish: Parkerized
Twist Rate: 1:24
Gas System: Mid-length
Gas Block Diameter: .750"
Feed Ramp: Single
Handguard: 15" Diamond Cut M-LOK, black
Muzzle Device: .450-caliber A2-style flash hider
Muzzle Threads: 5/8×32
Upper Receiver: Forged 7075 aluminum flat-top
Ejection Port: Enlarged .450/.458 big-bore cut
BCG and Charging Handle: Optional add-ons
Specifications
| Attribute | Specification |
|---|---|
| Manufacturer | Moriarti Armaments |
| Platform | AR-15 |
| Product Type | Upper Assembly |
| Caliber | .450 Bushmaster |
| Barrel Length | 18 inches |
| Barrel Profile | Heavy |
| Barrel Material | 4150 Chrome Moly Vanadium |
| Barrel Finish | Parkerized |
| Twist Rate | 1:24 |
| Barrel Fluting | Non-fluted |
| Feed Ramp | Single |
| Gas System | Mid-length |
| Gas Block Diameter | .750 inch |
| Muzzle Thread Pitch | 5/8×32 |
| Muzzle Device | .450-caliber A2-style flash hider |
| Handguard Length | 15 inches |
| Handguard Style | Diamond Cut M-LOK free-float |
| Handguard Color | Black |
| Upper Receiver | Flat-top, forged 7075 aluminum |
| Receiver Finish | Black |
| Ejection Port | Enlarged .450/.458 big-bore opening |
| Top Rail | Picatinny |
| Bolt Carrier Group | Optional add-on |
| Charging Handle | Optional add-on |
Package Includes
One assembled .450 Bushmaster 18" upper
Installed 15" black Diamond Cut M-LOK handguard
Installed .450-caliber A2-style flash hider
Installed gas system
Bolt carrier group only when selected
Charging handle only when selected
Lower receiver, magazine, and ammunition are not included.
Frequently Asked Questions
What barrel specifications does the .450 Bushmaster 18" upper use?
The upper features an 18-inch heavy-profile, non-fluted 4150 CMV barrel with a Parkerized finish, 1:24 twist rate, single feed ramp, and mid-length gas system.
What handguard and muzzle device are installed?
The upper features a 15-inch black Diamond Cut M-LOK handguard and a .450-caliber A2-style flash hider with 5/8×32 threads.
Does the upper include a bolt carrier group and charging handle?
Both components are optional add-ons and are included only when selected.
Product Image Notice
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