A modern shooting arsenal will not do without a high-quality body kit with additional accessories.

Best 300 Blackout Upper - Editor's Choice

In particular, almost every shooter needs flashlights, under the conditions of active combat, an under-barrel grenade launcher will definitely come in handy, and additional accessories for aiming will significantly increase shooting performance — each of your bullets must accurately hit the target. Weapon manufacturers took care of the weapon owners and provided them with additional blackout uppers for securing accessories. In our article, we will understand the main parameters of modern barrel rails and their purpose.

TOP-12 300 Blackout Upper | Best 300 Blackout Uppers

ImageProductBrand
Ghost Firearms Vital .300 Blackout UpperGhost FirearmsBUY
Aero Precision M4E1 Threaded Blackout UpperAero PrecisionBUY
Ghost Firearms Elite .300 Blackout Upper ReceiverGhost FirearmsBUY
Aero Precision M4E1 16" .300 Blackout Upper ReceiverAero PrecisionBUY
Daniel Defence DDM4 .300 Blackout UpperDaniel DefenceBUY
Radian Weapons .300 Blackout Complete Upper ReceiverRadian WeaponsBUY
Aero Precision AR15 .300 Blackout Barrel Complete Upper ReceiverAero PrecisionBUY
Radical Firearms .300 Blackout Upper ReceiverRadical FirearmsBUY
Radical Firearms .300 Blackout AR15 Upper ReceiverRadical FirearmsBUY
Radical Firearms .300 Blackout Upper Receiver 8.5 in.Radical FirearmsBUY
Radical Firearms 10.5 in. .300 Blackout Upper AssemblyRadical FirearmsBUY
Ghost Firearms .300 Blackout Complete Upper ReceiverGhost FirearmsBUY

#1 Ghost Firearms Vital .300 Blackout Upper

Ghost Firearms Vital .300 Blackout Upper

The blackout upper from a world-renowned manufacturer is specifically designed to combine performance and accuracy. Made with the highest quality materials on the market today, they will serve you for years to come. Manufactured following all current requirements of weapons chambered for .300. Equipped with the patented A2 Birdcage flame arrestor. Supplemented with a specialized gas system for adjusting the length of the pistol barrel. Extremely high quality and durable receiver with an additional anodized finish ensure reliable use for many years. Get this weapon accessory if you are looking for productivity and shooting accuracy.

What I liked:
  • Wide barrel twist rate;
  • A2 Birdcage Flash Hider;
  • Mil-Spec Hard Coat Anodized.
What I didn’t like:
  • Longer, than pictured.

#2 Aero Precision M4E1 Threaded Blackout Upper

Aero Precision M4E1 Threaded Blackout Upper

Transform your weapon into a stunning next-generation rifle with versatility with the 8” threaded blackout top receiver. Each of these receivers contains the patented Atlas S-One forend, fully compatible with low profile barrels as well as Mil-Spec barrels. The structure of chrome-molyvanadium alloy with a special QPQ coating reliably protects the barrel from corrosion inside and outside, ensures maximum shooting performance and long service life. Special connectors for lanyards allow you to securely attach a lanyard for convenient transportation of weapons, while not compromising the overall integrity and strength of the structure. Each shooter can choose which of the rails is best for attaching optics and accessories. Install the supplied 8” threaded top barrel. Ideal for hunting or tactical combat use. Provides maximum performance with each trigger pull.

What I liked:
  • Anodized steel coating;
  • Fully compatible with mil-spec AR15 upper receiver and barrel;
  • New Picatinny profile.
What I didn’t like:
  • Quality issues.

#3 Ghost Firearms Elite .300 Blackout Upper Receiver

Ghost Firearms Elite .300 Blackout Upper Receiver

Complement your shooting arsenal with quality components that are critical when you need maximum performance from every shot. Globally renowned Ghost Firearms have manufactured these top receivers from high quality 7075 T6 aluminum for the most durable and lightweight construction possible. Each upper receiver is crafted in conjunction with a patented pistol barrel length system, and also includes manual protection with an M-Lock free float that allows you to attach a wide range of accessories to your rifle. Every aspect of this receiver is crafted from high-quality materials to ensure the longest possible service life. Create a versatile rifle with this receiver, built to the most current gun industry standards.

What I liked:
  • A2 Flash hider/muzzle device;
  • Pistol length gas system;
  • Ghost Mil-Spec 7075 T6 Upper Receiver.
What I didn’t like:
  • Mounting issues.

#4 Aero Precision M4E1 16″ .300 Blackout Upper Receiver

Aero Precision M4E1 16" .300 Blackout Upper Receiver

This model of the upper receiver is equipped with additional medium profile barrels. Along with superior fit and finish, these AP15 rifle receivers come with an improved Gen-2 free-float forend with a patented Picatinny top rail system with an adjustable rail on three sides at once. The high strength receiver parts are fully compatible with most standard components of the AP15 and M4 rifles. The product has passed official tests by MRI and HP. By installing this receiver, you will have an incredible shooting experience.

What I liked:
  • High-quality 7075 T6 aluminum;
  • M4 feed ramp extension;
  • HP and MPI tested.
What I didn’t like:
  • Adjusting issues.

#5 Daniel Defence DDM4 .300 Blackout Upper

Daniel Defence DDM4 .300 Blackout Upper

The top receiver from the world’s most renowned manufacturer is equipped with a high-quality flame suppressor and durable 10.3-inch barrel manufactured using the latest cold-forged technologies. Made especially for those shooting enthusiasts who expect the best performance from 300BLK short-barreled rifles. Each upper receiver comes with a flame arrester and a patented pistol-length low profile gas system for smooth recoil. The forend DDM4 Rail 9.0 provides enough space for hanging accessories and has 3 comfortable Santoprene panels that are heat-resistant up to 300 degrees for complete protection of the shooter from burns. Turn your rifle into a work of art with the wide-profile platform.

What I liked:
  • Patented gas block system;
  • Chrome lined bolt carrier group;
  • Daniel Defense flash suppressor.
What I didn’t like:
  • Quality issues.

#6 Radian Weapons .300 Blackout Complete Upper Receiver

Radian Weapons .300 Blackout Complete Upper Receiver

The upper receiver, made according to half of the last technological trends, using the most advanced technologies. Thanks to high-quality components and materials, the manufacturers have managed to translate most of the wishes of experienced shooters into the form of this product. Equipped with fully symmetrical controls that are comfortable for both right-handed and left-handed users. Each model is hand-assembled by the hands of a highly qualified gunsmith who checks, tests, and clean the weapons themselves to ensure the high quality of each piece. This model meets the strictest quality standards – no detail has been overlooked. The product comes with a lifetime manufacturer’s warranty.

What I liked:
  • Anodized finish;
  • Ambidextrous controls;
  • Lifetime warranty.
What I didn’t like:
  • Mounting issues.

#7 Aero Precision AR15 .300 Blackout Barrel Complete Upper Receiver

Aero Precision AR15 .300 Blackout Barrel Complete Upper Receiver

The comprehensive receiver from the leading manufacturer on the market will perfectly complement your AP15 rifle. Due to its versatility, it is ideal for equipping weapons with additional accessories, and also optimizes the appearance. The combination of a lightweight forend and a low barrel profile with an unsupported upper receiver minimizes the overall weight of the weapon, making it a comfortable tool for hunting, clay pigeon shooting, and tense combat conditions.

What I liked:
  • Anodized finish;
  • High-quality materials;
  • Efficient recoil suppression.
What I didn’t like:
  • No manufacturer warranty.

#8 Radical Firearms .300 Blackout Upper Receiver

Radical Firearms .300 Blackout Upper Receiver

This model of the upper receiver provides a unique opportunity to equip your rifle with a variety of accessories that expand the range of its applications. Designed for law enforcement, equipped with a recessed receiver designed to be fitted with a Mil-Spec AR-15 bottom receiver. This top receiver model from innovators features excellent forward travel for improved accuracy and faster cooling. With a 16 ” diameter ejection port door, you can use this model to upgrade your rotorcraft with the latest headsets. The top dimmer assembly fits easily into any firearm without the help of a gunsmith. The upper receiver assembly fully complies with the most current US weapons industry standards. The perfect choice for every shooter.

What I liked:
  • Forward assist;
  • Ejection port door;
  • RF barrel nut.
What I didn’t like:
  • Adjusting issues.

#9 Radical Firearms .300 Blackout AR15 Upper Receiver

Radical Firearms .300 Blackout AR15 Upper Receiver

The latest model of the top receiver from the world’s leading manufacturers guarantees excellent workmanship and long service life. Ideal for completing the AR15 rifle and creating a real work of engineering and shadow art out of it. Thanks to the use of advanced technologies and high-quality materials, the designers managed to create a truly unique model that will be extremely useful both in sports competitions and in tactical combat conditions.

What I liked:
  • High-quality materials;
  • A2 flash hider;
  • Officially certified.
What I didn’t like:
  • Quality issues.

#10 Radical Firearms .300 Blackout Upper Receiver 8.5 in.

Radical Firearms .300 Blackout Upper Receiver 8.5 in.

If you’re looking for a law enforcement top receiver kit then the 8.5-inch Radical Firearms. The 300 AAC Blackout Upper Assembly is just for you – it’s the perfect choice for equipping your rifle with a variety of accessories, including optics, under-barrel grenade launchers, and others. 8.5-inch HBAR barrel with an additional flash suppressor and Forward Guard Shield (FGS) free-float forend. The use of high-quality materials allows this barrel model to be used for many years. Differs in easy installation on the lower receiver of the AP15 platform. The included FGS forend with the Radical Firearms Blackout Upper boasts a free-floating design that keeps your hands cool while firing, doesn’t get in the way of the barrel, and provides a variety of mounting options for additional accessories. This model will make a unique impression on professionals and amateurs alike, as it is a true work of engineering art.

What I liked:
  • Easy drop-in installation;
  • Multiple mounting options;
  • Great for optics attachment.
What I didn’t like:
  • Rail screw quality.

#11 Radical Firearms 10.5 in. .300 Blackout Upper Assembly

Radical Firearms 10.5 in. .300 Blackout Upper Assembly

The 10.5-inch flat-top upper receiver is intended for law enforcement personnel. Fully recessed and ready to fit any Mil-Spec AR-15 lower barrel. This receiver model fully complies with all the most relevant technical requirements, providing a high quality upper for any budget and shooting skill level. Supplied complete with top receiver, front assistant and ejection door, barrel adjusting nut. A barrel with a 10.5-inch HBAR profile and an A2 flame arrester will be the perfect complement to the AP15 platform. Made of high-quality chrome molybdenum alloy with 1-8 inch rolling speed. The M4 feed ramps and the low-profile gas macroblock protect the shooter from hot powder gases. Integrated Keymod and Picatinny rail for mounting flashlights, lasers, bipods, and scopes.

What I liked:
  • Forward assist;
  • Low profile micro gas block;
  • DGI stainless steel pistol-length gas tube.
What I didn’t like:
  • Installation issues.

#BONUS: Ghost Firearms .300 Blackout Complete Upper Receiver

Ghost Firearms .300 Blackout Complete Upper Receiver

The upper receiver kit is designed specifically to be the perfect addition to your weapon. Thanks to its wide customization options, it goes well with a variety of weapon accessories. The AR15 rifle bottoms use the most reliable components to provide you with years of reliable and efficient service. Leading design engineers have gone to great lengths to create a versatile and reliable product that is ideal for mounting on your rifle and further active use in sports and tactical shooting.

What I liked:
  • High-quality materials;
  • Perfect for AR-15 rifle;
  • Efficient lower receiver kit.
What I didn’t like:
  • Mounting issues.

FAQ

Can a 5.56 Upper shoot 300 Blackout?
Unfortunately, no;
Will 300 Blackout set off Tannerite?
Yes, it completely fits it;
What is the maximum effective range of a 300 Blackout?
460 meters;
Can a 300 Blackout kill a bear?
Yes, it surely can kill a bear.

Conclusion

Modern manufacturers are trying to pay special attention to equipping weapons with individual accessories that each shooter chooses for himself. Due to the possibility of replacing the upper receiver boxes, the possibilities of equipping weapons with various additional components – in particular, optical sights and under-the-head grenade launchers – are significantly expanded. Our top lists top receivers from the leading manufacturers in the arms industry. If you are looking for the most effective receiver for completing a large number of weapon accessories — choose models #2, #3, and #7. The ideal choice for tactical conditions — models #9 and #12. The best choice for AR-15 rifles according to the editorial staff is model number #11.

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