• Post category:Upper Receivers
  • Post last modified:August 1, 2022
  • Reading time:19 mins read

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Our Selection 11 Best 450 Bushmaster Upper

ImageProductBrand
Radical Firearms Complete Upper .450 BushmasterRadical Firearms Complete Upper .450 BushmasterRadical FirearmsBUY
Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15FailzeroBUY
GLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSHSSGLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSHSSGLFABUY
Brenton USA Stalker Carbon Hunter .450 Bushmaster Upper ReceiverBrenton USA Stalker Carbon Hunter .450 Bushmaster Upper ReceiverBrenton USABUY
GLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSHGLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSHGLFABUY
Wilson Combat Upper ReceiverWilson Combat Upper ReceiverWilson CombatBUY
Glfa Ar-15 Complete Upper .450 Bushmaster LJ450BUSHKGlfa Ar-15 Complete Upper .450 Bushmaster LJ450BUSHKGlfaBUY
Brenton USA Ranger Carbon Hunter .450 Bushmaster Upper ReceiverBrenton USA Ranger Carbon Hunter .450 Bushmaster Upper ReceiverBrenton USABUY
Radical Firearms 450 MHR Complete Upper ReceiverRadical Firearms 450 MHR Complete Upper ReceiverRadical FirearmsBUY
Next Level Armament 450 Bushmaster Complete Upper NLX501Next Level Armament 450 Bushmaster Complete Upper NLX501Next Level ArmamentBUY
American Tactical Imports AR-15 Complete UpperAmerican Tactical Imports AR-15 Complete UpperAmerican Tactical ImportsBUY

A .450 Bushmaster is constructed as an AR-15-friendly round with a good down-range performance and energy, appropriate for hunting. With the .450 Bushmaster, you can shoot down the game fast and humanely at 200 to 300 yards. The firing efficacy depends on proper barrel length: from a 16 inch to a 20-inch length is the best choice. The upper receiver is attached to the barrel and the forend, coming with the bolt carrier group, receiver frame, charging handle, forward assist, and dust covers.

Why do we need 450 Bushmaster upper?

Start building your rifle with the upper receiver, which is needed to protect the important internal parts. The upper allows enhancing the firearm accuracy even more than the lower receiver because the fired round or the loaded bullet operates in the upper one. The general performance and completed rifle weight depend on the upper as well.

Reliable upper receivers are usually forged or completely machined, including mounting rails for accessories. After upgrading the upper receiver, using an existing lower one, an AR-15 chambered for .450 Bushmaster will ensure dependable functioning.

Best Pick

GLFA AR-15 Complete Upper .450 Bushmaster 18in, NP3 LJ450BUSH

GLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSH

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The A3 flattop upper receivers provide rifles with stability and better control while firing.

Premium quality materials and superb parts are used for these complete uppers. The muzzle brake mitigates the recoil significantly.

#1 Radical Firearms Complete Upper Assembly .450 Bushmaster, 15in MHR, Single Ramp, Box, 4 models

Radical Firearms Complete Upper .450 Bushmaster

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Specification

Caliber: .450 Bushmaster
Barrel Twist Rate: 1-14
Handguard Style: Hybrid Rail

The Upper Assembly consists of an upper receiver, 450 Bushmaster 16-in Steel barrel (4140V) and magazine, Single Feed Ramp, custom ejection port door, RF Dimpled forward assist, barrel nut, dust cover, shell deflector, Panzer 5/8×32 muzzle brake, .936 in Micro Gas Block with Stainless carbine-length gas tube, MIL-STD charging handle, and staked bolt carrier group. This 15-in First-Gen Hybrid Rail System (FHR) upper is outfitted with the M-LOK fasteners on the sides and bottom, and the Picatinny rails at the fore-end to install optics, lights, lasers, bipods, and other accessories to equip the rifle with all needed.

Pros
  • Decent price

  • Fits well on the lower

  • Complete and assembled upper: neither extra time for building nor milling needed

  • Makes big holes

  • Very accurate

  • Great muzzle brake: less recoil than expected

  • Custom Forged and Black Anodized Upper

  • No issues with feeding or extracting unfired rounds

  • Direct Impingement Gas System

  • Complete 450 Bushmaster Melonite Coated, MPI BCG

  • Looks good

  • The bolt is a bit stiff, but workable after cleaning

Cons
  • Ammo is hard to find and a bit expensive

  • Needs specific or modded mags

  • Cycling problems: the fired cartridges aren’t extracted, have to disassemble the rifle after every shot and tap the bolt back to get the case out, have to keep cleaning and scrubbing the chamber

  • Doesn’t feed on Duramag or ACS magazine; it only feeds if one round is in the mag

#2 Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15 FZ45001NH

Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15

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Specification

Caliber: .450 Bushmaster
Gun Model: AR-15

This AR-15 complete bolt carrier group will operate for both 450 Bushmaster and 458 SOCOM. The Bolt Carrier Group is made from Steel, Exo nickel boron treated and covered with a classic finish. The long-lasting and reliable parts are used in the BCG construction.

The drop-in install system is suitable for most Mil-spec .450 Bushmaster upper receivers.

Pros
  • Fits Mil-spec .450 Bushmaster upper receivers

  • Dependable components

  • Quality Exo nickel boron treatment

Cons
  • Not rated yet

#3 GLFA AR-15 Complete Upper .450 Bushmaster 18in, S/S LJ450BUSHSS

GLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSHSS

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Specification

Caliber: .450 Bushmaster
Gun Model: AR-15
Handguard Length: 15 in
Barrel Length: 18 in
Weight: about 6lbs

The .450 Bushmaster Uppers with 1:24 in Twist include an 18-in Barrel (416 SST) with a big bore stainless steel muzzle brake, which allows keeping the shooter on the aim, providing the hunting rifle with its high efficiency. The AR15 Complete Upper receiver is equipped with M4 feed ramps, a floating M-LOK handguard to ensure easy optics and accessories installation. The Uppers are crafted from Aluminum and stainless steel with Black Matte Finish.

Pros
  • Direct impingement gas system

  • Good for pigs and feral hogs at a medium distance

  • Runs flawlessly with ASC and Duramags

  • Accurate and lightweight

Cons
  • No crush washer

  • Feed ramp needs a little polishing

  • Feeding issues: a failure to fire in the beginning, only after several cleanings seems to be getting better

  • Bolt is machined incorrectly that causes rounds to tip up

  • The firing pin is a bit short

#4 Brenton USA Stalker Carbon Hunter 18-Inch .450 Bushmaster Upper Receiver, 4 models

Brenton USA Stalker Carbon Hunter .450 Bushmaster Upper Receiver

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Specification

Caliber: .450 Bushmaster
Overall Length: 25.375 in
Barrel Length: 18 in
Gas Block Journal Size-Diameter: .875 in
Handguard Length: 13.5 in
Gun Model: Brenton Stalker Carbon Hunter
Weight: 2.06 lb

The Upper Receivers for Brenton USA rifles are outfitted with Performance Grade Medium Hunter Profile Barrel (416R Stainless Steel) with 1-24 Twist Rate, M-LOK attachment, HuntSize Charge Handle, Threaded Muzzle, Thread Protector (11/16×24), Carbon Fiber RealFeel Handguard, Bi-Pod/Sling Mount, Tripod Mount. The manufacturer guarantees the complete uppers are crafted from only reliable field-proven HuntSpec materials (Forged HuntPort Upper, Black Nitride Protective Barrel Finish, Nickel Boron BCG Coating), and compliance with all manufacturing processes.

Pros
  • Made in the USA

  • Suitable for a big game and varmint hunting

  • Durable corrosion-resistant materials and coatings

Cons
  • Not rated yet

#5 GLFA AR-15 Complete Upper .450 Bushmaster 18in, NP3 LJ450BUSH

GLFA AR-15 Complete Upper .450 Bushmaster LJ450BUSH

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Specification

Caliber: .450 Bushmaster
Gun Model: AR-15
Barrel Length: 18in

The A3 flattop upper receivers with a big bore muzzle brake (with 11/16 in X 24 in Muzzle Threads), 15-in floating M-LOK handguard, M4 feed ramps ensure rifle stability and better control while firing. The 18-in barrel (with a 1:24 in twist) is precision machined from chrome-moly (4150 CMV), covered with Nitride. The Complete Upper Receiver is made of Aluminum and Steel with Black Matte Finish. The .450 Bushmaster AR uppers are designed for the standard AR-15 lower receivers, so they operate well with the standard spring and buffer.

Pros
  • Premium quality materials and superb parts

  • Appropriate for boars, hogs, and other varmints hunting

  • Value for money

  • Shoots very well with little recoil

  • Fits nicely on multiple lowers

  • The muzzle brake mitigates the recoil significantly

Cons
  • None yet

#6 Wilson Combat Upper Receiver, 4 models

Wilson Combat Upper Receiver

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Specification

Caliber: 5.56x45mm NATO, .458 SOCOM
Gun Model: AR-15

The Wilson Combat offers 4 models of Upper Receivers: three are chambered for 5.56x45mm NATO, and one is for .458 SOCOM (stipped), which is suitable for .450 Bushmaster as well. The forged uppers are assembled, and the mil-spec models are stripped. The 458 SOCOM cartridge features the practical ballistics of the .45-70 in an AR platform rifle to shoot 250 to 600 grain .458 caliber rounds (in a lightweight, controlled shell). The uppers for the .458 SOCOM consist of the specific bolt, barrel, an adjustable gas block, extra power action spring, and straight gas tube for a standard dependability upgrade. The Lancer 20 round 5.56 magazine will be optimal for 7 SOCOM rounds, or the 30 round 5.56 mags – for 9 SOCOM rounds.

Pros
  • Made in the USA

  • Tight tolerances

  • For hunting medium to large game, rounds in the 250 grain- 400-grain weight range contain destructing killing power

  • Perfect fit and finish

  • The adjustable gas block allows the shooter to regulate gas volume to fine-tune the carbine’s bolt velocity for a specific load’s power

  • Zero chatter marks on the top rail

  • Minor machining of the upper receiver ejection port opening to ensure clearance for the larger cartridge ( .458 SOCOM)

Cons
  • Poor milling: seems like a dull bit was used to mill out the ejection port; sharp burrs on the ejection port, barely cleared the dust cover

  • Non-quality anodizing

  • The ejection port door doesn’t latch, and the forward assist roll pins don’t insert

#7 Glfa Ar-15 Complete Upper .450 Bushmaster 18″ Keymod LJ450BUSHK

Glfa Ar-15 Complete Upper .450 Bushmaster LJ450BUSHK

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Specification

Caliber: .450 Bushmaster
Barrel Length: 18 in
Barrel Twist Rate: 1-24
Gun Model: AR-15

The Great Lakes Firearms and Ammunition, LLC used rigid and long-lasting materials to manufacture the complete AR-15 uppers, chambered for .450 Bushmaster, to provide reliable rifle performance. This upper receiver is integrated with an 18-in barrel. The upper assembly is crafted from 4150 CMV Steel with Black Nitride coating.

Pros
  • American-made quality product

  • Chrome-moly steel is rigid and corrosion-resistant

Cons
  • Not rated yet

#8 Brenton USA Ranger Carbon Hunter 22-Inch .450 Bushmaster Upper Receiver, 4 models

Brenton USA Ranger Carbon Hunter .450 Bushmaster Upper Receiver

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Specification

Caliber: .450 Bushmaster
Overall Length: 29.375 in
Barrel Length: 22 in
Barrel Profile: Medium Hunter
Gas Block Journal Size-Diameter: .875 in
Barrel Twist Rate: 1-24
Handguard Length: 15 in
Weight: 2.38 lb

This complete upper assembly is manufactured from Forged metal for HuntPort Upper; Stainless Steel (416R) with Black Nitride Protective Finish for Barrel; Carbon Fiber for Handguard; and Nickel Boron Coating for BCG. There are 4 upper models available in such colors: Foliage MarbleKote, Snow MarbleKote, Harvest MarbleKote, Midnight MarbleKote. The Upper Receivers is designed for Brenton USA Ranger Carbon Hunter rifles, coming with Performance Grade Barrel, M-LOK attachment, HuntSize Charge Handle, Threaded Muzzle, Thread Protector (11/16×24), RealFeel Handguard, and Mounts (Bi-Pod/Sling and Tripod).

Pros
  • Made in the USA

  • All used materials are field-proven by HuntSpec

  • Long-lasting corrosion-resistant materials and finish

  • Good for a big game and varmint hunting

  • All manufacturing processes comply

Cons
  • Not rated yet

#9 Radical Firearms 16in, 450 MHR Complete Upper Receiver Group CFU9.5-450BUSH-7MHR

Radical Firearms 450 MHR Complete Upper Receiver

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Specification

Caliber: .450 Bushmaster
Barrel Length: 16 in
Gas System Length: Pistol Length
Handguard Length: 7 in

The Upper Receiver Group is equipped with a 16-in barrel, 7-in Handguard, Panzer Brake (Muzzle Device), and Pistol-Length Gas System. The Complete uppers are covered with Black Mil-Spec.

Pros
  • Optimal barrel length for .450 Bushmaster rifle’s precise performance

  • Reliable coating

Cons
  • California’s Proposition 65

  • Not rated yet

#10 Next Level Armament 450 Bushmaster Complete Upper NLX501

Next Level Armament 450 Bushmaster Complete Upper NLX501

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Specification

Caliber: .450 Bushmaster
Handguard Length: 13 in
Handguard Type: Free-Float
Threads per Inch: 11/16×24

The Next Level Armament, taking into account the 450 Bushmaster bullet growing popularity and AR15 shooters’ needs in an upper for hunting, developed complete forged upper receivers with dependable components to ensure great accuracy and range for these large caliber rounds. The uppers are manufactured from Aluminum (7015), and Steel (4140) with Black Nitride finish in specialized factories. The upper assembly consists of NLA 13-in M-Lok handguard with 16-in barrel (or 15-in M-Lok handguard with 18-in barrel), muzzle brake, NLA billet low profile gas block, Tromix 18-in mid-gas (or 16-in carbine gas), 5-Round magazine, Ambidextrous Charging Handle, Heavy Duty spring, Bolt Carrier with DLC finish, Tromix .450 BM Bolt.

Pros
  • Legal accurate shotgun is good for deer or hogs hunting even in Michigan, Ohio, Indiana, Iowa

  • Included all the upgrades standards

  • Precision Aerospace machining

  • Two options of the barrel and handguard lengths

Cons
  • Not reviewed yet

#11 American Tactical Imports AR-15 Complete Upper, ATI15MS450BM

American Tactical Imports AR-15 Complete Upper

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Specification

Caliber: .450 Bushmaster
Barrel Length: 16 in
Handguard Length: 15 in

This upper receiver is designed for AR-15 with KeyMOD Gun Rail. The upper receiver comes with a 16-in barrel with 1:24 twist, a 5/8×32 compensator (not a flash hider), a Nitride bolt carrier group, a carbine length gas system, and a 15-in Keymod rail.

Pros
  • Durable Black Matte coating

Cons
  • Not yet rated

FAQ

What is included in a complete upper receiver?
A completed upper consists of the ejection port door and the installed forward assist button. Complete upper assemblies come with the barrel, charging handle, handguard, and frequently with the bolt carrier group.
Do you need a special upper for 450 bushmasters?
The 450 Bushmaster works with standard AR15 lowers and parts.

It is simple to make an AR build with a 450 bushmaster upper receiver, just purchase a complete upper and mags that compensate for the suboptimal Bushmaster case design.

How many yards is a 450 Bushmaster good for?
According to the shooters’ and hunters’ experience, the most effective distance for the 450 Bushmaster is around 250-to-300 yards, which is enough for the most medium-sized game.
How bad is the recoil on a 450 Bushmaster?
The recoil power for the .450 will depend on the gun weight, it can vary between 15 and 20 ft-lbs. To make these figures clear, let’s compare them, for instance, a 3-inch 20 gauge rattles at 30 ft-lbs, and a 44 mag has 11 ft-lbs.
Does the 450 Bushmaster kick?
The .450 Bushmaster is developed to work in AR-15 rifles. The factory load generates nearly 23 ft-lbs of recoil, and a full-power 12-gauge bullet spawns 45 ft-lbs.
How much does a 450 Bushmaster drop at 200 yards?
The .450 Bushmaster delivers a rather flat path out to 200 yards.

Zeroed rifles at 150 yards can provide a rise of 1.8 inches at 100 yards, and a 4.9-inch expected drop at 200 yards.

Conclusion

While searching a 450 Bushmaster upper, pay attention to its twist rate, barrel length, material, and construction durability (forged metal is stronger than machined or cast one), and ease of installation (friendly customization, enough space for optics), and whether included Forward Assist, which helps prevent cycling malfunctions.

There are two builds with different types of barrel, handguard, and gas blocks installation: a striped one with included forward assist and ejection port cover ensures weight and speed, while the assembled one for an SPR (special purpose rifle) provides more accuracy.

The longer the barrel, the more the round’s velocity, although the best length option for a .450 Bushmaster barrel is from 16 to 20 inches to ensure a softer shot, and with a dependable chamber to deliver more precision.

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