The .300 Blackout caliber has seen a surge in popularity recently among recreational shooters and tactical users alike. This round offers versatility that makes it appealing for a variety of applications, from home defense to hunting. 

 

Choosing the right upper receiver is crucial to build an AR-15 that is optimized for your specific needs and shooting style. This comprehensive guide will explore the top .300 Blackout uppers on the market to help you decide which one is best suited for you. 

 

We’ll cover factors to consider including intended use, quality of components and value. Read on to determine the ideal upper to harness the immense capabilities of the .300 Blackout!

 

Why Choose a .300 Blackout Upper? 

 

One of the main advantages of the .300 Blackout is that it is compatible with standard AR-15 lower receiver assemblies and magazines designed for 5.56 NATO ammunition. This means you can convert an existing 5.56 AR rifle to .300 Blackout simply by swapping out the upper receiver group. The .300 Blackout round was designed specifically for the AR platform, allowing it to function reliably with existing components like buffers, triggers, grips and stocks.  

 

For shooters interested in suppression the .300 Blackout truly shines when paired with a suppressor.  It is easier to achieve subsonic velocities simply by changing the bullet weight and with the addition of a suppressor it becomes exceptionally quiet. 

 

This combination of compactness and quiet operation has made it popular for home defense needs. The ability to switch between supersonic and subsonic loads with the change of a magazine grants the .300 Blackout unmatched versatility as well.

 

How We Selected the Best .300 Blackout Uppers

 

In picking the top 5 .300 Blackout uppers, we paid special attention to key features like precision, dependability and strength to perform in real situations. We evaluated critical parts including the barrel, bolt carrier group and handguard for high-quality manufacturing. We also considered practical features to improve the shooting knowledge, like adjustable gas systems and ambidextrous controls.

 

Our choices were informed by the collective skill and expertise of our Pro-Armory team. Our experience comes from years in the military, competition shooting and working in the firearm industry. 

 

We also closely studied online reviews and feedback from users, gathering details on various types of ammo and bullet weights to rate each model's flexibility. By comparing prices to performance, our team assessed value across different uses.. Our goal was to suggest great choices for all budgets, with affordable options.

 

Top 5 .300 Blackout AR-15 Uppers

 

1. Palmetto State Armory (PSA) .300 Blackout Uppers

 

Palmetto State Armory is well known among AR users for producing a wide range of upper receivers and rifle builds that don’t break the bank. Their .300 Blackout uppers come in various configurations to suit any need, from ultra-compact 7.5” pistols to 16” rifles. Barrel lengths for nearly any purpose are available so you can choose the ideal setup for your shooting applications. 

 

Short barrels, under 10,” are well suited to maneuverable pistol builds and CQB scenarios, while maintaining reliability with proper ammunition selection. For shooters wanting good velocity from a balanced platform, mid-length barrels from 10.5” to 14.5” offer an excellent blend of portability and ballistic performance. Moving to the 16” rifle-length uppers from PSA, these configurations fully unleash the capabilities of .300 Blackout loads, making them ideal for hunting and precision shooting at extended ranges.

 

Across the board, PSA’s .300 Blackout uppers are known for dependable functionality paired with the extremely affordable prices that PSA has built its reputation on. 

 

Pros

 

• Wide variety of configurations 

• Very affordable price points

• Known for reliability

 

Cons 

 

• Fixed gas block limits customization

 

2. Ballistic Advantage .300 BLK Uppers

 

While relatively new compared to some brands, Ballistic Advantage has quickly made a name for itself among modern AR builders due to an uncompromising commitment to quality and performance at fair prices. Their .300 Blackout barrels and uppers live up to this reputation, offering exceptional accuracy and reliability that rivals top-tier manufacturers at a fraction of the cost.

 

Two of their most popular .300 Blackout offerings are the 9” and 10.3” Hanson series barrels, available as standalone components or complete upper receiver groups. The 9” barrel, paired with a 7” handguard, creates an incredibly compact package capable of tackling CQB scenarios and home defense duties while still optimizing the .300 Blackout's effective range and terminal ballistics.  For shooters wanting just a bit more versatility without sacrificing maneuverability the 10.3” Hanson barrels strike a perfect balance.

 

Regardless of configuration, Ballistic Advantage’s barrels are renowned for their precision manufacturing and thoughtful design features like optimized gas ports. This translates into enhanced compatibility and functioning with both supersonic and subsonic loads. If you’re searching for an accurate, reliable .300 Blackout upper receiver that doesn’t break the bank, Ballistic Advantage deserves a close look.

 

Pros

 

• Excellent balance of cost and performance

• High-quality construction 

• Reliable with various ammo types

 

Cons

 

• Does not include BCG and CH

• Limited barrel length options

 

3. Aero Precision M4E1 .300 BLK Uppers 

 

Aero Precision is revered among hobbyists and professional builders alike for their manufacturing expertise that translates into precisely machined, high-end AR components. The M4E1 series of upper receivers continues this trend of excellence by incorporating clever ambidextrous controls and design improvements that enhance reliability.

 

Available with .300 Blackout barrel lengths of 8”, 10” and 16” the M4E1 uppers offer exceptional quality and customization at a reasonable price point. Aero uses premium materials like forged 7075-T6 aluminum matched with barrel steel that meets and exceeds military specifications. The upper receiver features an integral trigger guard and enlarged feed ramp to improve functioning. Meanwhile the handguards come in multiple lengths, materials and mounting options to perfectly match your preferences.

 

For those wanting to upgrade an existing rifle or build a new one from the ground up, Aero Precision M4E1 uppers present an appealing balance of looks, performance and value that is sure to satisfy.

 

Pros 

 

• Robust build quality

• Good selection of barrel lengths  

• Aesthetically pleasing design

 

Cons

 

• Higher price point

• BCG and CH sold separately

 

4. Radian Model 1 .300 BLK Complete Upper

 

Situated at the top tier of the AR market, Radian Weapons prides itself on producing what it calls “engineering art” – the pinnacle of design, performance and aesthetics. The Model 1 series in .300 Blackout actualizes this goal, yielding exceptional accuracy and reliability perfect for discerning shooters. No corners were cut; these uppers are made from the highest grade materials and assembled under strict quality control at Radian’s state-of-the-art facility.

 

The foundation is built on the premium match-grade 416R stainless steel barrel, which is optimized with the Model 1’s tuned gas system for exceptional precision on both supersonic and subsonic loads. Attached to this barrel is an enhanced M16 bolt carrier group with a proprietary coating that reduces friction and cleaning time. Ambidextrous charging is managed smoothly via the Raptor-SD handle, designed to mitigate gas blowback when shooting suppressed. Even the 15” M-LOK handguard, featuring anti-rotation pins, adds to the top-tier quality.

 

While expensive compared to most alternatives on the market, serious marksmen will find that they get what they pay for with the Radian Weapons Model 1, which is guaranteed to deliver sub-MOA accuracy when paired with proper match-grade ammunition.

 

Pros

 

• Superior accuracy and performance 

• High-quality control standards

• Fully equipped with top-tier components

 

Cons  

 

• Premium price may be prohibitive for some budgets

 

5. Brownells BRN-180 Uppers

 

If you’re searching for something distinct from traditional direct impingement AR-15 uppers, the BRN-180 family from Brownells provides an intriguing gas piston-driven option. Inspired by the ArmaLite AR-18 of decades past, the BRN-180 eliminates the buffer tube assembly in favor of a short-stroke piston mechanism. The result is a uniquely configurable platform suitable for smaller profiles.

 

The piston system allows the BRN-180 upper receivers to reliably cycle rounds without the buffer assembly found in standard AR-15 uppers. This enables collapsible stocks or braces to be replaced with folding units on shortened barrels under 16”, creating an ultra-compact package. Brownells offers 10.5” and 16” .300 Blackout configurations for you to choose from depending on your needs. The adjustable gas block also allows shooters to fine-tune cycling behavior, which is especially helpful when shooting suppressed.

 

For AR users looking for customization options outside the norm, the innovative BRN-180 design opens new possibilities for .300 Blackout builds that function as impressively as they capture attention at the range.

 

Pros

 

• Innovative design allows for compact folding configurations

• Adjustable gas block for fine-tuning  

• Reliable piston mechanism

 

Cons

 

• Compatibility issues with standard AR-15 parts

• Limited aftermarket options due to unique design

 

Best .300 Blackout Barrel Length?

 

Barrel length choice plays an important role in determining the overall capabilities and behavior of your .300 Blackout upper assembly. As barrel length changes so does the potential velocity of bullets as the powder charge imparts kinetic energy into projectiles.

 

This directly impacts effective range and penetration. Shorter barrels trade increased maneuverability and compactness for somewhat decreased ballistic performance, while longer barrels provide higher muzzle velocities at the cost of added weight and bulk.

 

Most shooters balance these priorities based on their particular needs and applications.

 

Factors Influencing Choice

 

The intended use of your .300 Blackout rifle determines ideal barrel length more than any other factor. Compact maneuverability for home defense or transport dictates the need for shorter barrels, while hunting applications benefit from maximizing velocity and terminal ballistics.

 

The use of a suppressor, often paired with 300 Blackout uppers, can also support reliable functioning from shorter barrels by increasing backpressure.

 

Magazine compatibility should be ensured as well, with subsonic rounds requiring specific COAL for proper feeding.

 

Optimal Barrel Lengths

 

9-inch Barrels – This ultra-short barrel length prioritizes minimal size and weight above all else. Perfect for AR pistol builds used in home defense or as truck guns. Reliable functioning should be tested with preferred ammunition when running suppressed. However, the shorter barrel may not allow complete powder burn, potentially reducing velocity and increasing muzzle flash. Ballistic arcs tend to suffer at longer ranges.

 

10.3-inch Barrels – Considered by experts as the “sweet spot” for balancing reliability, velocity and ergonomics. Short enough for maneuverability yet long enough to ensure consistent cycling of most loads, especially with a suppressor.  This length is also ideal for achieving a complete powder burn, enhancing ballistic efficiency without significant trade-offs. Limited terminal performance beyond 200 yards but it provides adequate accuracy within that range.

 

16-inch Barrels – The longest commonly used barrels maximize .300 Blackout ballistic potential, reaching velocities akin to the 7.62x39mm cartridge. This length ensures complete combustion of powder, maximizing velocity and minimizing unburnt residue. Ideal for hunting medium game or precision shooting out to 400+ yards. The longer sight radius also aids in improving consistency. Weight and size increase substantially over shorter barrels.

 

Expert Opinions

 

Renowned barrel manufacturer Clint Hanson with Ballistic Advantage recommends a 10.3” barrel as the most versatile option, balancing maneuverability with reliability across various loads. Meanwhile, writers from Guns & Ammo Magazine suggest 16” barrels for hunters wanting maximum velocity for ethical shots on deer and hogs beyond 100 yards.

 

There’s certainly no universally ideal barrel length but rather preferences based on individual needs.

 

.300 Blackout Safety 

 

While the .300 Blackout has soared in popularity thanks to its versatility, the caliber does come with unique safety considerations. Since its external case dimensions are nearly identical to the 5.56 NATO round, there exists a risk of accidentally chambering and firing .300 Blackout in a 5.56 rifle.

 

The result of this user error is catastrophic damage to the firearm and potential injury, making it essential to perform diligent safety checks.

 

Critical Safety Concerns  

 

The .300 Blackout cartridge, when loaded into a 5.56 NATO chamber and fired, can produce pressures that exceed the barrel’s strength tolerances dramatically. This causes the barrel to rupture violently, damaging the rifle and endangering the shooter and bystanders with shrapnel.

 

Tragically, accidents of this nature continue occurring among recreational shooters and trained military personnel alike.

 

While the .300 Blackout round physically fits into a 5.56 chamber without any obvious indication of trouble, the two ammunition types cannot be used interchangeably. Unfortunately, there is no mechanism to prevent this user error aside from strict adherence to safety protocol.

 

Preventive Measures

 

Ammunition Storage – Store .300 Blackout and 5.56 ammunition separately using visibly distinct containers like color-coded ammo cans or magazine pouches to minimize mixing live rounds. Utilize translucent magazines to easily verify the loaded cartridge type.

 

Double-Checking – Make a habit of visually confirming both the stamped barrel caliber markings as well as the loaded cartridge type before chambering any rounds or firing a weapon. Taking an extra moment to verify prevents complacency. Consider using conspicuous indicator tags for rifles dedicated to .300 Blackout use and label magazines loaded with .300 Blackout ammunition as a constant reminder.

 

Educational Training – Seek formal firearms safety training from qualified professionals, especially for those new to the AR platform or switching between calibers like 5.56 and .300 Blackout. Emphasize developing safe handling habits through repetition.

 

Handling Misfires and Malfunctions

 

Should an audible “pop” or muffled “bang” occur without a loud gunshot after pulling the trigger, a squib stuck in the barrel or ruptured casing may have occurred. Ensure the weapon is pointed in a safe direction and remove all ammunition sources from the area immediately.

 

With the firearm completely empty, visually inspect the chamber and bore for obstructions or damage using a bore light. Each step should be done methodically after ensuring the weapon is safe.

 

Once the firearm is fully disassembled, bring the rifle to a certified gunsmith who is qualified to diagnose malfunctions before attempting to operate it again.

Conclusion

 

The .300 Blackout has earned its place as one of the most versatile AR calibers available today. Optimized for the AR-15 platform, it strikes a unique balance between power and portability. Mated with the right upper receiver, its capabilities stretch from home defense, hunting, to tactical applications with the option of using a suppressor. This round will continue to grow in popularity due to its flexibility.

 

The uppers showcased here represent some of the best options currently on the market to harness the strengths of the .300 BLK. Carefully assess your needs and preferences to decide which solution fits you best. Whichever direction you pursue, building proficiency and safe handling habits with your new upper should remain your top priority.

FAQs

 

What is the effective range of .300 Blackout ammunition?

 

The effective range depends greatly on the barrel length and whether you are shooting supersonic or subsonic loads. From a 9-inch pistol barrel, supersonic rounds typically retain useful accuracy out to 150-200 yards. Subsonics are best limited to 100 yards or less. In longer 16-18 inch rifle barrels, supersonics can stretch out accurately to 500+ yards in the hands of a skilled marksman.

 

Does .300 Blackout offer good hunting performance? 

 

With proper ammunition selection and shot placement, the .300 Blackout has taken deer, hogs and black bear successfully. Stick to quality expanding bullets from 110-220 grains, with 130 grain often cited as an excellent balance of penetration and expansion for medium game like deer.

 

Why choose .300 Blackout over 5.56 NATO?

 

While the 5.56 certainly has its place, the .300 BLK offers distinct advantages in AR platforms including better performance from short barrels, optimized behavior with suppressors and flexibility with ammunition types. The ability to efficiently run both supersonics and subsonics in the same magazine grants .300 BLK unmatched versatility.

 

Is .300 Blackout safe to shoot in a 5.56 chamber?

 

Absolutely not. While .300 BLK rounds may chamber in a 5.56 barrel, firing them can cause catastrophic explosive failure resulting in severe damage and injury. Strictly adhere to safety procedures like checking headstamps.

 

What optics are ideal for a .300 Blackout upper?

 

Holographic sights and red dots ranging from 20mm up to 30mm lenses offer quick target acquisition and clarity for shorter range use under 100 yards. For shooting at extended ranges, low power variable optics (LVPOs) in the 1-6x or 1-8x magnification range balance situational awareness and precision.

 

What maintenance tips help prolong .300 BLK upper receiver life?

 

Due to some inherent fouling tendencies from the powder used, focus on meticulous bore cleaning especially when shooting subsonic rounds. High pressure loads also accelerate metal wear so replace extractor springs and bolts proactively around the 5,000 – 7,000 round counts. Apply lubricant liberally to the BCG.