Description
The Bushmaster Flat Top Receiver Assembly Complete- 20″ Barrel – 450 Bushmaster, BCG is a complete upper receiver assembly that transforms a standard AR-15 lower into a powerful, big-bore hunting or brush gun. Chambered in the hard-hitting 450 Bushmaster cartridge, this 20-inch barreled upper is engineered for taking down medium to large game at short to medium ranges with authority. It arrives ready to mate with your existing lower receiver—no gunsmithing required—making it a straightforward upgrade for hunters and shooters seeking more terminal impact than a standard 5.56mm round can provide.
Key Features
- Complete Upper Assembly: Includes barrel, flat-top receiver, bolt carrier group (BCG), and charging handle.
- 450 Bushmaster Chambering: Delivers heavy .452″ diameter projectiles with significant energy for ethical game takedown.
- 20″ Barrel Length: Optimizes velocity for the cartridge, providing a stable shooting platform and effective sight radius.
- Flat Top Receiver: Features a continuous Picatinny rail for versatile optic mounting, from red dots to magnified scopes.
- Mil-Spec Compatibility: Designed to work with standard AR-15 lower receivers, offering broad compatibility.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | 450 Bushmaster |
| Barrel Length | 20 Inches |
| Receiver Type | Flat Top (A3) with Picatinny Rail |
| Assembly Includes | Barrel, Upper Receiver, BCG, Charging Handle |
| Compatibility | Standard AR-15 Lower Receivers |
| Muzzle Thread | 11/16″-24 (Common for .450 Bushmaster) |
Who This Upper Assembly Is For
This assembly is built for the Missouri hunter pursuing whitetail, feral hogs, or other tough game in dense timber or agricultural fields where shots are often under 200 yards. When it comes to home defense in rural settings, the 450 Bushmaster’s formidable stopping power is a serious consideration, though over-penetration is a factor to weigh. It’s also for the shooter who already owns an AR-15 lower and wants to quickly configure a dedicated, powerful hunting rifle without building a completely new firearm. At $587.77, it represents a focused investment in a specific capability.
Pros & Cons
Pros: The primary advantage is immediate, heavy-hitting power in a familiar AR platform. The complete assembly is drop-in ready, saving time and tools. The 20-inch barrel maximizes the cartridge’s potential ballistics. Its compatibility means it can live on a dedicated lower or share one with other uppers you own.
Cons: Ammunition cost and availability are higher than for common calibers like 5.56 or .223. Recoil is more pronounced. The cartridge is not designed for long-range shooting, so its utility is specialized. Magazine capacity is typically limited to 3-5 rounds for reliable feeding.
Frequently Asked Questions
Q: What magazines does this 450 Bushmaster upper use?
A: It requires specific .450 Bushmaster magazines or modified .458 SOCOM magazines for reliable feeding. Standard 5.56/.223 PMAGs will not work correctly with the larger cartridge.
Q: Can I use my existing 5.56/.223 lower receiver with this upper?
A: Yes, that’s the key benefit. This upper is designed to work with a standard, mil-spec AR-15 lower receiver. You will need to pair it with a .450 Bushmaster-specific magazine.
Q: Is this considered a firearm when purchased?
A: No. This is an upper receiver assembly, not a serialized firearm. It can be shipped directly to your door in most states. However, attaching it to a lower receiver to create a complete rifle requires that lower to have been transferred through an FFL. This complete upper assembly is available at firearms-missouri.com for Missouri residents and nationwide.
Look, if your need is for decisive power within practical hunting distances, this assembly delivers. It converts your versatile AR platform into a tool with a singular, potent purpose. The build quality is solid, and the setup is straightforward. That said, commit to the caliber—understand its ballistics, source your ammo and mags, and practice with it. This Bushmaster upper provides a direct path to a capable big-bore rifle.
Configure your next hunting or brush gun with this complete upper assembly.
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