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  • Post category:Upper Receivers
  • Post last modified:April 6, 2024
  • Post published:November 17, 2022

Best 350 Legend Upper Review

What is a 350 Legend Upper? 🧐

It is a key component of a firearm, specifically designed for the 350 Legend cartridge, a round celebrated for its speed and reduced kickback. The Upper encompasses the barrel, bolt, and firing mechanism of the firearm. Its standout features include high velocity, significant energy delivery, and reduced recoil. This component is particularly designed to be compatible with AR-15 lower receivers.

Our Top Pick
Brenton USA Tracker 22in .350 Legend Upper Receiver
This robust receiver is designed for long-lasting durability, featuring the innovative Brenton Patent Pending ReceiverLock and precision-engineered HuntSpec controls and tolerances. Additionally, it is equipped with a Brenton RealFeel handguard and a Gas Diverting Charge Handle to ensure peak performance.
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Features 😎

🔘  These uppers are meticulously designed to perfectly accommodate the high-velocity 350 Legend cartridge, ensuring remarkable speed and pinpoint precision for shooters who demand nothing less.

🔘 Moreover, the reduced recoil of these uppers stands out as a major attribute, delivering a comfortable and easily manageable shooting experience, even for beginners venturing into the world of firearms.

🔘 Furthermore, it showcases an impressive energy delivery capability, a factor that becomes particularly crucial in demanding scenarios such as hunting or competitive shooting. The remarkable energy transfer facilitated by these uppers ensures optimal impact and effectiveness, providing shooters with a distinct advantage.

🔘 And that’s not all – the versatility is further enhanced by their seamless compatibility with AR-15 lower receivers. This compatibility allows for easy integration into various firearm configurations, making these uppers a versatile and invaluable addition to any shooter’s arsenal.

Our Top Pick
CMMG Mk4 .350 Legend Resolute Upper Group Receiver
The CMMG Mk4 .350 Legend Resolute Upper Group Receiver is an ideal choice for deer hunters seeking a high-velocity, straight-walled cartridge that provides outstanding target impact and reduced recoil. This receiver is engineered to seamlessly interface with any standard AR15 lower group and includes all essential components and accessories for your upcoming build.
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If you click this link and make a purchase, we earn a commission at no additional cost to you.

Maintenance Tips 🎯

🔰 Maintaining an Upper requires a careful and detailed approach. It’s pivotal to keep it clean and well-lubricated to ensure it operates optimally and lasts for a long time.

🔰 After each use, it’s recommended to disassemble the Upper and clean it thoroughly. The use of a high-quality gun cleaning solvent can help remove residue, while a good gun oil can be used for lubrication.

🔰 It’s also crucial to inspect the Upper for any signs of wear and tear, such as cracks or unusual markings, as these could affect its performance or safety.

🔰 When disassembling the Upper, pay special attention to the bolt assembly and the chamber, as these areas often experience the most wear. Clean them meticulously, ensuring all debris and fouling are removed.

🔰 For the bolt assembly, a nylon brush can be used to scrub away any stubborn residue, followed by a thorough wipe-down with a clean cloth.

🔰 When cleaning the chamber, a chamber brush with solvent-soaked patches can effectively remove buildup and ensure smooth operation.

⭕ In addition to regular cleaning, it’s beneficial to conduct periodic inspections for any potential issues. Carefully examine the Upper for any signs of fatigue, like stress cracks or unusual markings. If any defects or abnormalities are found, it’s crucial to address them promptly to maintain performance and safety.

It’s important to note that the methods and frequency of maintenance may vary based on how frequently the firearm is used and the specific conditions it’s used in.

Benefits 🔥

✴️ First and foremost, their high velocity ensures quick and efficient rounds, which often translates into superior performance in a variety of shooting scenarios including hunting and competitive shooting.

✴️ The significant energy delivery capability of these Uppers is another major advantage. This means they can provide an impactful shot, which is particularly essential during big game hunting.

✴️ Moreover, these Uppers are specifically designed to fit AR-15 lower receivers, making them versatile and easy to integrate into various firearm configurations. This compatibility allows for greater flexibility and customization options for shooters.

✴️ Lastly, the long-term benefits cannot be overlooked. When properly maintained, 350 Legend Uppers are durable and reliable, providing excellent value for money and ensuring a longer lifespan for the firearm.

Best 350 Legend Upper Review

1# Brenton USA Stalker Carbon Hunter

Brenton USA Stalker Carbon Hunter

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The Brenton USA Stalker Carbon Hunter is the perfect choice for serious hunters who demand the best in performance and durability. This high-quality rifle features a forged HuntPort upper receiver, nickel boron BCG coating, HuntSize charge handle, and a performance-grade barrel for exceptional accuracy and reliability. The threaded muzzle is protected by a black nitride protective barrel coating, and the real-feel carbon fibre handguard provides a comfortable grip. The 10G MarbleKote camo finish ensures concealment in any environment, and the bi-pod/sling mount and tripod mount make it easy to transport and set up. The long load hunting mag with 5 rd. the removable limit block provides plenty of ammunition for extended hunting trips.

Video review

  • Forged HuntPort upper receiver
  • Nickel boron BCG coating
  • HuntSize charge handle
  • Performance-grade barrel
  • Threaded muzzle
  • Black nitride protective barrel coating
  • Real-feel carbon fibre handguard
  • 10G MarbleKote camo finish
  • Bipod/sling mount
  • Tripod mount
  • The camo finish might not be to everyone’s taste


2# Brenton USA Tracker 22in .350 Legend Upper Receiver

Brenton USA Tracker 22in .350 Legend Upper Receiver

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Looking for a top-quality upper receiver that can handle anything you throw at it? Look no further than the Brenton USA Tracker 22in .350 Legend Upper Receiver. This tough receiver is built to last with its Brenton Patent Pending RecevierLock and HuntSpec controls and tolerances. It also comes with a Brenton RealFeel handguard and Gas-diverting charge handle for optimal performance. Plus, it’s backed by a lifetime warranty from Brenton USA, so you can be confident in its quality. Order your Brenton USA Tracker 22in .350 Legend Upper Receiver today!

  • Tough receiver built to last
  • Brenton Patent Pending RecevierLock and HuntSpec controls and tolerances
  • Comes with a Brenton RealFeel handguard and Gas-diverting charge handle
  • Baked in a Life-Time Warranty
  • May be too tough for some hunters


3# CMMG Mk4 .350 Legend Resolute Upper Group Receiver

CMMG Mk4 .350 Legend Resolute Upper Group Receiver

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The CMMG Mk4 .350 Legend Resolute Upper Group Receiver is perfect for deer hunters who need a fast-moving, straight-walled cartridge that delivers optimal power on target with less recoil. This receiver is designed to work with any standard AR15 lower group and comes with all the necessary parts and accessories for your next build. With its quality construction and attention to detail, the CMMG Mk4 .350 Legend Resolute Upper Group Receiver is sure to give you many years of reliable performance. Order yours today and be ready for your next hunting adventure.

  • Quality construction
  • Attention to detail
  • Fast-moving, straight-walled cartridge
  • Optimal power on target
  • Less recoil
  • None found


4# CMMG – Resolute 200 Mk4 .350 Legend Complete Upper Receiver

CMMG - Resolute 200 Mk4 .350 Legend Complete Upper Receiver

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The CMMG Mk4 .350 Legend Resolute Upper Group Receiver is perfect for those looking for an American-made receiver that can take a beating. Featuring a 16.1″ 4150 Chrome Moly Vanadium Steel barrel with a 1:16 Twist and Medium Taper, this receiver is built to withstand anything you throw at it.

Additionally, the CMMG RML15 M-Lok hand guard provides a secure grip while the hard coat anodized finish on the receiver and hand guard protects against wear and tear. The CMMG standard-type charging handle also makes it easy to chamber rounds, while the carbine length gas port location ensures reliable operation.

Lastly, the SV brake provides superior muzzle control and is threaded 1/2-28 (9mm) for compatibility with a wide range of accessories. Whether you’re looking for a durable receiver for your next hunting trip or want something that can stand up to heavy use at the range, the CMMG Mk4 .350 Legend Resolute Upper Group Receiver is perfect for you.

  • American-made
  • Durable
  • 16.1″ 4150 Chrome Moly Vanadium Steel barrel
  • 1:16 Twist
  • Medium Taper
  • RML15 M-Lok hand guard
  • Hard coat anodized finish
  • Standard-type charging handle
  • Carbine-length gas port location
  • Receivers are not always mil-spec
  • May be difficult to find compatible parts
  • Barrels may not be as accurate as other brands


5# Aero Precision M4E1-T 16in Complete Upper

Aero Precision M4E1-T 16in Complete Upper

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The Aero Precision M4E1-T 16in Complete Upper is the best high-quality and durable AR15 upper receiver on the market. This top-of-the-line upper receiver is designed for long-lasting performance and features heavy-duty construction and quality materials. The M4E1-T also features a Mil-Spec Type III Hardcoat Anodized finish for added durability and protection. With its superior design and construction, the Aero Precision M4E1-T is sure to provide you with years of reliable service.

Video review

  • Heavy-duty construction
  • Quality materials
  • Mil-Spec Type III Hardcoat Anodized finish
  • May be too heavy for some shooters
  • The finish may not be durable


6# POF USA Minuteman 350 Legend Upper Receiver

POF USA Minuteman 350 Legend Upper Receiver

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The POF USA Minuteman 350 Legend Upper Receiver is a top-of-the-line choice for any serious shooter. Featuring an ambidextrous Strike Eagle charging handle, a DI bolt carrier group with our patented Roller Cam Pin, and a Renegade Rail with patented oversized heat sink barrel nut, this upper receiver is sure to give you the edge you need on the range or in the field.

Additionally, it features a carbine-length gas system on the pistol and a mid-length gas system on the rifle, making it versatile and easy to use in any situation.

Plus, with a proprietary 3-prong flash hider and nitride heat-treated barrel, this upper receiver is built to last. So if you’re looking for a high-performance upper receiver that will give you the edge you need, look no further than the POF USA Minuteman 350 Legend Upper Receiver.

  • Ambidextrous Strike Eagle charging handle
  • DI bolt carrier group with our patented Roller Cam Pin
  • Renegade Rail with patented oversized heat sink barrel nut
  • Carbine-length gas system on the pistol
  • Mid-length gas system on the rifle
  • Proprietary 3-prong flash hider
  • Pricey compared to other options
  • Limited colour selection


7# Aagil Arms Complete AR-15 .350 Legend Upper Assembly

Aagil Arms Complete AR-15 .350 Legend Upper Assembly

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The Aagil Arms Complete AR-15 .350 Legend Upper Assembly is perfect for anyone in the market for a reliable and durable AR-15 upper assembly. This complete upper assembly is perfect for any AR-15 platform and comes with everything you need for a Carbine length gas system. The 16″ barrel is made from high-quality black anodized aluminium and has a 1-16 twist rate. The handguard is 15″ long and made from M-LOK compatible aluminium. It also comes with an A2 muzzle device.

  • Durable
  • Reliable
  • Perfect for any AR-15 platform
  • Comes with everything you need
  • May be too durable for some shooters
  • Handguard may be too long for some shooters


8# JARD AR Side Charge No Bolt Upper Receiver Assembly

JARD AR Side Charge No Bolt Upper Receiver Assembly

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Check out the JARD AR Side Charge No Bolt Upper Receiver Assembly. This high-quality receiver is made from lightweight yet durable anodized aluminium and features a 16″ carbine-length barrel with a 1-16 twist rate. It also has a 15″ M-LOK compatible handguard for attaching your favourite accessories and comes with an A2 flash hider. For the ultimate in reliability, the JARD AR Side Charge No Bolt Upper Receiver Assembly is a perfect choice.

  • Lightweight and durable
  • Anodized aluminium construction
  • 16″ carbine-length barrel
  • 1-16 twist rate
  • 15″ M-LOK compatible handguard
  • A2 flash hider
  • Installation can be tricky
  • Complicated disassembly and reassembly

Assembly Tips 🛠️

🏁 Firstly, it is crucial to thoroughly check the compatibility of your AR-15 lower receiver with the 350 Legend Upper to avoid any complications down the line.

🏁  Once you have confirmed compatibility, take the time to meticulously clean both the Upper and Lower Receivers. Removing any dust, dirt, or residue will not only contribute to a seamless installation but also help maintain the longevity of your firearm.

🏁 To further optimize the performance of your upper, it is advisable to apply a light coat of oil to the moving parts. This simple step ensures smooth operation and reduces friction, ultimately enhancing the overall shooting experience.

🏁 Additionally, during the installation process, pay close attention to the alignment of the pivot and takedown pins on your lower receiver with the corresponding holes in the upper receiver. Proper alignment is crucial for a secure fit, and it ensures that the two pieces come together seamlessly.

🔴 Prioritizing safety is paramount when dealing with firearms. Before beginning the installation, always double-check to ensure that the firearm is unloaded. This fundamental precaution helps prevent any accidental discharge and promotes a safe working environment. Besides, it is highly recommended to wear appropriate eye protection throughout the installation process.

⚫ While the installation process can be successfully completed by an experienced gun owner, it is always advisable to seek professional assistance if you are not entirely comfortable or familiar with the process. Entrusting the installation to a professional ensures that it is done correctly and safely, guaranteeing optimal performance from your firearm.


What is the typical barrel length for a 350 Legend upper?
🔘 The 350 Legend cartridge was designed specifically for use in 16-inch barreled rifles. This barrel length was chosen as an optimum balance of ballistic performance, manoeuvrability, and legal considerations. They can range from as short as 9 inches for specialized builds up to 24 inches on precision rifles. But the 16-inch length remains the norm.

🔘 With a 16-inch barrel, the 350 Legend produces a muzzle velocity of approximately 2,300 fps. This maintains sufficient energy for hunting medium game out to 200+ yards.

🔘 Shorter pistol-length barrels around 10 inches have much lower velocities around 1,800 fps, limiting effective range. They trade power for manoeuvrability.

🔘 Longer 18-20 inch barrels provide minimal additional velocity over 16 inches. They add weight without much ballistic benefit.

🚩 The 16-inch length is convenient for shooters because it meets the minimum rifle barrel length requirement under the National Firearms Act (NFA). No tax stamp is required.

Can I convert my existing AR-15 to a 350 Legend upper?

Yes, it is indeed possible and relatively straightforward to convert an existing AR-15 to accommodate a 350 Upper.

⭕ However, it is essential to ensure that the lower receiver of your firearm is compatible with this upper before proceeding with the conversion. By making this conversion, shooters can unlock the manifold benefits offered by the 350 Legend cartridge.

⬜ The 350 Legend cartridge boasts high velocity, which translates to exceptional downrange performance. Its impactful energy delivery makes it a popular choice for hunting and target shooting alike. Additionally, shooters can expect reduced recoil when utilizing the 350 Legend cartridge, enhancing overall shooting comfort and control.

While the conversion process is feasible, it is important to note that it does require a certain level of technical knowledge and experience. If you feel unsure or uncomfortable conducting the conversion yourself, it is highly recommended to seek professional assistance. This ensures that the conversion is performed correctly and safely.

Are there any legal restrictions or regulations regarding 350 Legend uppers?

There are a few legal considerations regarding these upper receivers, though relatively few restrictions compared to other rifle calibres:

  • ⚫ As a standard straight-walled rifle cartridge, it is legal for hunting in many areas that prohibit high-power bottleneck cartridges. Always check local regulations.
  • ⚫ Like most rifle uppers, the 350 Legend is limited to a minimum barrel length of 16” on a rifle or 18” on a long gun due to the National Firearms Act (NFA). Shorter barrels classified as “short-barreled rifles” require ATF registration and a $200 tax stamp.
  • ⚫ Suppressors are legal for use with this type of upper as long as the buyer passes an ATF background check and registers the suppressor. No stamp is required if the barrel is 16” or more.
  • ⚫ Some states prohibit semi-auto uppers in certain hunting situations, so a straight-pull bolt-action 350 uppers may be required.
  • ⚫ No special permits or licensing requirements exist to purchase or own a 350 upper beyond standard federal and state rifle purchase laws.

So few specialized restrictions apply to the 350 Legend. But general rifle laws related to barrel length, pistol vs. rifle platforms, and magazine capacity should be followed. Always consult state and local ordinances as well.

Can I use standard AR-15 magazines with a 350 Legend upper?

🟪 Yes, standard AR-15 magazines can generally be used with a 350 upper, but it’s important to consider that the performance and reliability may vary. This is because AR-15 magazines were originally designed to accommodate a range of calibres, so while they can physically fit and feed the 350 Legend cartridges, optimal performance is not guaranteed.

🚩 To ensure the best reliability and efficiency, it is recommended to use magazines specifically designed for the 350 Legend cartridge. These magazines are specially engineered to match the dimensions and characteristics of the cartridge, resulting in smoother feeding and overall superior performance.

As always, safety and proper handling of firearms should be the top priority. If you have any uncertainties or concerns, it’s advisable to consult a firearms professional or refer to the manufacturer’s guidelines. Taking these precautions will help ensure a safe and enjoyable shooting experience.

Is it possible to suppress a 350 Legend upper?

Suppressors, also known as silencers, can be attached to the muzzle of your 350 Legend upper to mitigate the noise created during firing. By incorporating this additional component, you can significantly reduce the auditory impact of your shots, making it a more enjoyable experience for both yourself and those around you.

🔷 The 350 Legend cartridge, with its relatively mild recoil and subsonic capability, lends itself particularly well to being suppressed. The lower recoil ensures better stability, allowing for improved accuracy and control. Moreover, the subsonic nature of the cartridge means that the bullet travels below the speed of sound, resulting in a quieter discharge.

➡️ This combination of reduced noise and enhanced shooting performance can greatly enhance the shooting experience, particularly for those who are sensitive to loud noises or interested in maintaining a degree of stealth while hunting. The ability to take precise shots without disturbing the surrounding environment not only reduces noise pollution but also increases the likelihood of a successful hunt.

🔴 However, it’s important to remember that suppressors must meet the legal requirements set by local and national laws, and you must ensure you comply with these regulations.

Conclusion 🤩

The 350 Legend Upper offers a host of benefits for shooting enthusiasts, from high velocity and impactful shots to reduced recoil and ease of compatibility with AR-15 lower receivers. Maintaining them through regular cleaning, lubrication, and inspections can ensure longevity and reliability.

The installation, while achievable for experienced gun owners, involves careful attention to detail, safety precautions, and ideally, professional assistance. Adhering to manufacturer instructions is always key for optimal performance and safety.

Thus, the 350 Legend Upper stands as a high-performing, versatile and reliable choice for both seasoned shooters and novices alike.

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6 months ago

Hey everyone, I’ve been experiencing some gas leakage issues with my 350 Legend upper. It seems like there’s gas escaping near the gas block. Has anyone else encountered this problem? Any ideas on how to fix it?

    6 months ago
    Reply to  Bobby

    I had a similar problem a while back. It turned out that the gas block wasn’t properly aligned and tightened. Make sure you check the alignment and torque down the screws properly. Also, check your gas tube for any damage or kinks that might be causing leaks.

      6 months ago
      Reply to  Bobby

      I had a gas leakage issue once, and it turned out to be a loose gas key on the bolt carrier group. Make sure it’s staked properly and tightened down securely.

        6 months ago

        I recently built a 350 Legend upper for my AR, and I’ve been wondering about the best optics for it. Anyone have recommendations for scopes or red dot sights that work well with this cartridge?

          Ralph Teren
          Ralph Teren
          6 months ago
          Reply to  Russell

          I’ve been using a 1-4x scope on my 350 Legend upper, and it’s been great for hunting. You get the versatility of close-quarters shooting with 1x and the ability to reach out a bit with 4x for those longer shots. It’s a good balance.

            6 months ago

            Hi! What are the most common uses for a 350 Legend upper, aside from hunting and self-defense?

              6 months ago

              I’ve got a 350 Legend upper on my AR, and I love it. The straight-wall cartridge is great for hunting in states that have those restrictions, and the recoil is pretty mild. Ammo availability has improved over the past couple of years too.