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18" 450 Bushmaster Complete Upper - CMV HBAR - 15" Rail - BCG - CH
READY TO SHIP
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450 Bushmaster Complete Uppers
Ballistic Barn builds 450 Bushmaster complete upper receivers for hunters and shooters who want hard-hitting straight-wall performance on the AR-15 platform. Every upper is assembled in-house, individually checked for proper headspace, inspected for fit and function, and built with carefully selected components. The 450 Bushmaster is capable of pushing common 250-grain loads beyond 2,200 fps depending on ammunition and barrel length, combining heavy .45-caliber performance with the familiar handling and fast follow-up capability of an AR-15. Configure your 450 Bushmaster AR-15 upper with available barrel lengths, handguards, barrel profiles and muzzle-device options. Complete upper configurations include a compatible 450 Bushmaster BCG and charging handle when specified.
Read More About Our 450 Bushmaster Uppers
Hard-Hitting Straight-Wall Performance for the AR-15
Why Choose a 450 Bushmaster Upper?
Every Ballistic Barn 450 Bushmaster upper is assembled in-house using carefully selected components for dependable AR-15 performance. Each upper is individually checked for proper headspace using Manson GO and NO-GO gauges, inspected for fit and function, and built for hunters and shooters who want hard-hitting straight-wall performance from a 450 Bushmaster upper.
Built for Powerful Short- to Medium-Range Hunting
The AR-15 platform pairs naturally with the 450 Bushmaster for hunters who want heavy .45-caliber performance with familiar controls and fast follow-up capability. A 450 Bushmaster AR delivers substantial short- to medium-range energy while retaining the modularity of the AR-15. The cartridge is particularly well suited to deer, hog and similar hunting applications where lawful, and its straight-wall design has made it popular in jurisdictions that permit qualifying straight-wall rifle cartridges for deer hunting.
Straight-Wall Cartridge
Popular for hunting in jurisdictions that permit qualifying straight-wall rifle cartridges.
Heavy .45-Caliber Bullets
Common 250-grain loads can provide substantial energy for short- to medium-range hunting.
AR-15 Platform
A 450 Bushmaster AR-15 upper delivers big-bore performance in a familiar and configurable platform.
Headspace Checked
Each upper is individually verified using Manson GO and NO-GO gauges.
Dedicated Bolt and Magazines Are Required
The 450 Bushmaster requires a dedicated 450 Bushmaster bolt in an AR-15-pattern carrier and magazines designed for the cartridge. A standard .223 Remington or 5.56 NATO bolt is not interchangeable with the caliber-specific bolt required for a 450 Bushmaster upper.
Why Buy From Ballistic Barn?
Individually Headspace Checked
Built in Fredericksburg, Texas
Configurable Component Options
Inspected for Fit and Function
Ballistic Barn AR-15 uppers are assembled in-house using carefully selected components. Every 450 Bushmaster complete upper is inspected for fit and function and individually checked for proper headspace using Manson GO and NO-GO gauges before shipping. Available configurations allow hunters and builders to select the barrel, handguard and component combination that best fits their AR-15 build.
450 Bushmaster Upper Specifications and Compatibility
| Feature | Specification | Why It Matters |
|---|---|---|
| Caliber | 450 Bushmaster | Provides heavy .45-caliber straight-wall hunting performance from the AR-15 platform. |
| Platform | AR-15 | A 450 Bushmaster upper receiver fits compatible standard-dimension AR-15 lower receivers. |
| Common Barrel Twist | 1:24 | A common twist rate for stabilizing widely available 450 Bushmaster hunting bullets. |
| BCG Compatibility | AR-15 carrier with dedicated 450 Bushmaster bolt | A dedicated 450 Bushmaster bolt is required and is not interchangeable with a standard 5.56 NATO bolt. |
| Gas System | Matched to barrel length and configuration | Correct gas-system selection supports dependable cycling and balanced operation. |
| Muzzle Thread | Varies by barrel configuration | Large-bore barrels may use different thread patterns, so verify the individual 450 Bushmaster upper listing before selecting a muzzle device. |
| Magazine Compatibility | 450 Bushmaster-specific AR-15 magazines | Cartridge-specific magazines support reliable feeding of the large straight-wall case. |
| Primary Application | Deer, hog and similar hunting applications | Well suited to powerful short- and medium-range hunting where the cartridge is appropriate and lawful. |
450 Bushmaster Upper FAQs
What is included in a complete 450 Bushmaster upper?
A 450 Bushmaster complete upper includes the assembled upper receiver, barrel, gas system, handguard, compatible 450 Bushmaster bolt carrier group and charging handle when specified by the product configuration. Every Ballistic Barn upper is fully assembled, inspected for fit and function, and individually checked for proper headspace using Manson GO and NO-GO gauges.
Will a 450 Bushmaster upper fit my AR-15?
Yes. Ballistic Barn 450 Bushmaster uppers are designed for compatible standard-dimension AR-15 lower receivers. The rifle must use the correct 450 Bushmaster bolt, appropriate magazine and compatible supporting components.
Can I use my 5.56 BCG with a 450 Bushmaster upper?
No. The 450 Bushmaster requires a dedicated bolt because the bolt-face dimensions differ from those used for .223 Remington and 5.56 NATO. Complete uppers that include a BCG use the compatible 450 Bushmaster bolt carrier group.
What is the 450 Bushmaster best for?
The 450 Bushmaster is primarily used for deer, hog and other appropriate hunting applications at short to moderate distances. Its heavy .45-caliber bullets and substantial energy make it attractive to hunters who want straight-wall cartridge performance from the AR-15 platform.
What is the effective range of the 450 Bushmaster?
The 450 Bushmaster is generally considered a short- to medium-range hunting cartridge. Practical effective range depends on ammunition, barrel length, environmental conditions, target, optic setup and shooter.
How fast is the 450 Bushmaster?
Common 250-grain 450 Bushmaster loads can exceed 2,200 fps depending on ammunition and barrel length. Actual muzzle velocity varies by load, barrel configuration and environmental conditions.
What barrel length is best for a 450 Bushmaster upper?
The best barrel length depends on intended use. A shorter 450 Bushmaster upper can produce a more compact hunting rifle for woods and blind use, while longer barrels may provide additional velocity and a steadier feel. Review the available 450 Bushmaster upper configurations to choose the barrel length that best matches your hunting requirements.
What barrel twist rate is commonly used for 450 Bushmaster?
A 1:24 twist is common for 450 Bushmaster barrels and works with many widely available hunting loads. Always match the barrel specifications to the ammunition you plan to use.
Does the 450 Bushmaster use a standard AR-15 bolt and magazine?
No. The cartridge requires a dedicated 450 Bushmaster bolt and magazines designed for the cartridge. The carrier remains AR-15 pattern, but the bolt face and magazine system are caliber-specific.
Why is 450 Bushmaster popular in straight-wall hunting states?
Many jurisdictions that restrict certain bottleneck rifle cartridges for deer hunting permit qualifying straight-wall cartridges. The 450 Bushmaster provides substantial hunting performance from the AR-15 platform, but hunters should always verify current state and local regulations.
Why buy a 450 Bushmaster upper from Ballistic Barn?
Every 450 Bushmaster upper is assembled in-house using carefully selected components, individually inspected for fit and function, and checked for proper headspace using Manson GO and NO-GO gauges. Available configurations allow customers to select components that better match their particular AR-15 build and hunting application.