Best Buffer Spring For 300 Blackout

The 300 Blackout rifle is a newly popular choice for hunting, competitive shooting, and even urban tactical situations. That’s because you get performance akin to a 7.62×39 mm while using standard sized AR mags. However, you’ll want to assure that your firearm is properly tuned, and one of the best ways to do this with a 300 Blackout rifle is with a buffer and spring.

Changing out the one you have could lead to far better performance overall and give you a better and more satisfying experience. It’s common to need to adjust the weight and spring tension to give you just enough that you’re able to lock the bolt back with the mag is empty. With too light an option, the recoil won’t get reduced, and if it’s too heavy, you run the risk of failure of the bolt locking.

A Quick Look At Our 10 Best Buffer Springs For 300 Blackout Rifles

What To Look For In A Buffer Spring For 300 Blackout

Aero Precision AR15 Carbine Buffer Kit APRH100151 Gun Model: AR-15

If you’re in the market for a buffer spring for your 300 Blackout rifle, you first need to consider the right weight pairing of the buffer with the spring coil. There are 3 weight classes, H1, H2, and H3, ranging from about 3.8 ounces to 5.4 ounces, and finding the right weight is essential for the entire process of using your firearm.

In addition, you need to consider the coil, starting with what you need is dependent upon whether you have a subsonic or supersonic 300 Blackout rifle. You’ll also need to know specifications of your firearm, such as muzzle device, BCG weight, barrel length, and gas port size, to name a few. Typically, flat wire springs have greater reliability and last longer, while braided wire springs are better for dampening.

Top 10 Buffer Springs For 300 Blackout Rifles

To help you determine what the best buffer springs for your 300 Blackout rifle are, take a look at this comprehensive list, full of facts and specifications that will help you make your decision.

1. Brownells AR-15 Buffer Retainer Springs

BROWNELLS - AR-15 BUFFER RETAINER SPRINGS
  • Spring Material: chrome silicon
  • Packaging: Single or 3-Pack
  • Installation: Drop in
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Brownells AR-15 Buffer Retainer Springs live up to the reputation of the manufacturer, offering high quality operation without a high price tag. With the Brownells name behind the product, you are guaranteed to find that the quality of the materials used in construction and the tooling live up to the original spring from the rifle manufacturer. This helps reduce concern about parts fitting or lasting long enough to make it worth the purchase.

These drop in springs are easy to install, replacing existing springs in a snap. This makes it quite valuable to invest in a couple of these to carry as backups, especially when hunting in a group, so that you can come to the rescue should you or your hunting partners need to quickly replace a buffer spring. These springs are manufactured to a precise tolerance, which gives you more assurance about their performance with your AR-15 setup. You can purchase a single spring or a three pack so you have plenty of options in a pinch.

Who Should Buy Brownells AR-15 Buffer Retainer Springs?

The Brownells AR-15 Buffer Retainer Springs are useful for anyone who needs an inexpensive way to revive an old 300 Blackout rifle, wants to have an extra one on hand in case it’s needed, and wants to be sure that quality of the rifle is maintained at a very low cost point.

Pros

  • Quality and construction match OEM quality
  • Great value for the money
  • Easy installation

Cons

  • Doesn’t include any advanced technology

2. Geissele Automatics Super 42 Braided Wire Spring & Buffer

GEISSELE AUTOMATICS LLC - SUPER 42 BRAIDED WIRE SPRING & BUFFER
  • Spring Material: braided wire
  • Packaging: Single
  • Installation: Drop in
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The Geissele Automatics Super 42 Braided Wire Spring & Buffer are manufactured specifically with enhanced performance and reliability in mind. In fact, the spring and buffer combo performs well even when using up that poor quality ammo you might have accidentally purchased or come across for a low price to use as target practice. They even fire reliably with dirty ammo. The braided design of the wires also assists with longevity, helping to reduce compacting of the spring so that it retains strength and doesn’t shorten over time.

This design also reduces overall noise from the spring, so there is less distraction from the twanging when firing. The spring and buffer are carbine length and are best equipped for firing 300 Blackout supersonic rounds. Because each of the three braided wires flexes independently, you get reduced harmonics and long time reliability against displacing too much energy.

Who Should Buy a Geissele Automatics Super 42 Braided Wire Spring & Buffer?

The Geissele Automatics Super 42 Braided Wire Spring & Buffer is ideal for anyone who needs improved smoothness and quiet firing of supersonic 300 Blackout rounds.

Pros

  • Reliable even with poor quality or dirty ammo
  • Retains strength much longer than average
  • Braided design is quieter

Cons

  • Not ideal with subsonic 300 Blackout rounds

3. Aero Precision AR-15 Carbine Buffer Kit

Aero Precision AR15 Carbine Buffer Kit APRH100151 Gun Model: AR-15
  • Spring Material: steel
  • Packaging: full buffer kit
  • Installation: Uses lock nut
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The Aero Precision AR-15 Carbine Buffer Kit affords you greater opportunity to bring an older 300 Blackout rifle back to life, coming with all the components related to the buffer rather than just the spring. This buffer kit includes a mil spec six position buffer tube crafted from 7075-T6 aluminum, a three ounce carbine buffer, an end plate, a lock nut, and the buffer spring, so you have a complete solution.

The precision machining of all the parts is a signature of this manufacturer, and it assures that all parts will solidly fit your AR setup. It’s a lightweight option, coming in at 9.8 ounces, and it’s tested in house to assure it cycles smoothly. The steel construction of the spring means you’re less likely to experience corrosion, even over time and with lots of rapid fire. Having the entire buffer kit also gives you peace of mind that you won’t have to make a number of adjustments to assure all the components fit properly and function well together.

Who Should Buy an Aero Precision AR-15 Carbine Buffer Kit?

If you’re looking for a complete buffer kit that includes new buffer springs for your 300 Blackout rifle, the Aero Precision AR-15 Carbine Buffer Kit is a perfect solution. This is great for those who need performance on a budget.

Pros

  • Extremely lightweight
  • Includes all components of a buffer system
  • Tight fit to most firearms

Cons

  • Packaging is not ideal for protecting parts such as the finish on the buffer tube

4. Nemo 300 Blackout Carbine Buffer Spring

NEMO - .300 BLACKOUT CARBINE BUFFER SPRING
  • Spring Material: 17-7 stainless steel
  • Packaging: single
  • Installation: drop in
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The Nemo 300 Blackout Carbine Buffer Spring is different from the average buffer spring for 300 Blackout rifles, giving you more choices of ammunition to fire. While the typical buffer spring is tooled for high tension and use with supersonic rounds, this particular spring specifically offers reduced power that functions ideally with subsonic rounds.

Because of the special engineering, you get far more reliability and performance from the subsonic rounds than you would with other buffer springs. The spring is also tooled in a way that it cures the problem of short cycling when you have a firearm that is undergassed. Optimal use is with a 16 inch barrel and a carbine length gas system chambered for 300 AAC Blackout rounds. The 17-7 stainless steel construction means it is more heat resistant, won’t compact easily, and resists corrosion for longer.

Who Should Buy a Nemo 300 Blackout Carbine Buffer Spring?

The Nemo 300 Blackout Carbine Buffer Spring is ideal for those looking specifically for an excellent spring to work well with subsonic 300 Blackout rounds. It’s versatile for those who have other preferred ammo, but it’s best for those who mainly stick to a standard 300 Blackout rifle.

Pros

  • Reduced stiffness for performance with 300 Blackout rifle
  • Versatile to work with other ammo
  • Ideal for subsonic ammunition

Cons

  • May have to make adjustments for other rounds

5. David Tubb’s Lightweight Stainless Steel Buffer Spring For AR-15

David Tubb’s Lightweight Stainless Steel Buffer Spring for AR-15
  • Spring Material: Stainless steel
  • Packaging: single
  • Installation: drop in
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David Tubb’s Lightweight Stainless Steel Buffer Spring is a highly reliable option that offers improved performance under all conditions so you never have to worry about spring failures. This is partially due to the material used in construction of the buffer spring. Rather than the standard music wire, this spring is crafted from true, hard stainless steel so that it doesn’t corrode, doesn’t compact and shorten over time, and won’t cause mysterious misfires or failures in your 300 Blackout firearm.

The energy provided by this particular spring matches those that are labeled ‘extra power’; however, this particular spring is far lighter in weight than the average extra power spring, which provides you better optimization of the entire rifle and all its accessories without adding too many ounces to the customized piece. With reduction of recoil and controlled rebound, this spring helps you keep focused on the target quickly and effectively, which is especially useful when you need to fire in rapid succession.

Who Should Buy a David Tubb’s Lightweight Stainless Steel Buffer Spring?

David Tubb’s Lightweight Stainless Steel Buffer Spring is ideal for those who are looking to improve the performance and smooth firing of 300 Blackout rifles and want something lightweight and easily compatible. If you want something that isn’t affected by temperature, or if you’re tired of variance or malfunctions, this is your solution.

Pros

  • Unaffected by temperature even during rapid fire
  • Reduced instances of spring induced malfunctions
  • Certified materials used for construction

Cons

  • Specific for low pressure loads, not very versatile

6. Expo Arms AR-15 Carbine Length Buffer Spring

Expo Arms AR-15 Carbine Length Buffer Spring
  • Spring Material: Music wire
  • Packaging: single
  • Installation: drop in
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The Expo Arms AR-15 Carbine Length Buffer Spring is an inexpensive option that fulfills a number of needs when you’re out in the field. It may seem flippant to put value in the fact that this buffer spring is offered with a variety of bumper colors. However, if you’re someone who changes out your components and chambers different caliber rounds frequently, it can make a difference to have color coding that allows you to quickly identify which spring you need.

Because you have multiple options here, you can choose the one that doesn’t overlap with your other springs. The spring is constructed from music wire for less pressure requirements to obtain performance. The spring is designed to be used with a carbine length receiver extension for an AR 300 Blackout firearm.

Who Should Buy an Expo Arms AR-15 Carbine Length Buffer Spring?

The Expo Arms AR-15 Carbine Length Buffer Spring is perfect for someone looking to keep extra springs as a backup in a pinch without spending a large sum of money. It’s best for those with an AR-15 carbine length receiver.

Pros

  • Low cost for the quality
  • Multiple bumper colors available
  • Use of quality material

Cons

  • Not as long lasting as some of the pricier brands

7. Sprinco M4 / AR-15 Blue Enhanced Power Carbine Buffer Spring

Sprinco M4 / AR-15 Blue Enhanced Power Carbine Buffer Spring
  • Spring Material: Chrome silicon
  • Packaging: single
  • Installation: drop in
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The Sprinco Blue Enhanced Power Carbine Buffer Spring is set up for easy use and top quality performance, with materials that are guaranteed to be reliable and sturdy. The chrome silicon used in the construction of the spring is the same material used in Formula One motor valve springs, which tells you just how sturdy it is and how heat resistant it can be, giving it incredible longevity.

The spring is tooled for use with a carbine length buffer tube and a mid length gas system that are paired with 300 AAC Blackout rounds. The enhanced power afforded by the material construction assures that you have accuracy and incredible reliability when firing your 300 Blackout rifle. The spring is heat treated and shot peened for quality control, and the spring has blue color coding for matching it to the correct system.

Who Should Buy a Sprinco Blue Enhanced Power Carbine Buffer Spring?

The Sprinco Blue Enhanced Power Carbine Buffer Spring is an ideal choice for anyone able to spend a little more to get a lot more quality and may be firing rapidly for long periods of time. If you’re using a carbine length buffer and a mid length gas system, you’ll love this buffer spring.

Pros

  • Extremely heat resistant
  • Use of quality chrome silicon in construction
  • Treated with proprietary formula to improve longevity

Cons

  • Only works with carbine length buffers and mid length gas systems

8. Anderson Manufacturing AR-15 Buffer Spring

Anderson Manufacturing AR-15 Buffer Spring - Rifle
  • Spring Material: Music wire
  • Packaging: single
  • Installation: drop in
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The Anderson Manufacturing AR-15 Buffer Spring takes advantage of the AM system of computer manufacturing that has created such incredible rifles, pistols, and other firearm parts. This particular spring is constructed using music wire and tooled to work with a fixed stock A1/A2 receiver extension.

Because these are manufactured in house, you get the best quality made-in-the-USA construction, complete with rigorous testing for precision and durability. Better yet, these springs are extremely affordable, making them the perfect extras to carry along in case you need them while you’re in the field. Unlike most buffer springs, however, you get a limited lifetime warranty that protects you against any manufacturer defects.

Who Should Buy an Anderson Manufacturing AR-15 Buffer Spring?

If you’re looking for an affordable American made part, the Anderson Manufacturing AR-15 Buffer Spring is an excellent choice. It’s ideal for anyone looking for an inexpensive way to keep extra buffer springs on hand for rifles with fixed stock A1/A2 receiver extensions.

Pros

  •  Extremely inexpensive
  •  In house construction for verified quality control

Cons

  • Optimized only for fixed stock A1/A2 receiver extensions

9. JP Enterprises Custom Buffer Spring

JP Enterprises Custom Buffer Spring - Centerless Ground and Polished - Carbine
  • Spring Material: Chrome silicon
  • Packaging: single
  • Installation: drop in
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The JP Enterprises Custom Buffer Spring is perfectly tooled to create optimal accuracy, reliability, and performance for your 300 Blackout rifle. Its precise operation is partially due to a centerless ground that creates the ability to limit sound, reducing the twang of the mil spec spring to the point of near elimination. Unlike some buffer springs for AR rifles, you’ll find that this one isn’t lightweight. Its heavier construction is great for reducing recoil and improving impulse feel, which helps you recover sight faster so you have more reliability in accuracy. The chrome silicon material means smooth operation without easily becoming compacted or getting corroded. The spring works well for both recreational users as well as serious firearm users.

Who Should Buy a JP Enterprises Custom Buffer Spring?

The JP Enterprises Custom Buffer Spring is a great option for novices looking to upgrade from the least expensive, basic buffer springs, as well as for experienced shooters who are a little budget conscious but still want high quality parts.

Pros

  •  Optimized for both novices and experienced shooters
  • Custom tuned for reliability
  • Chrome silicon construction is extremely heat resistant

Cons

  • Quality is not quite mil spec

10. Strike Industries AR-15 Carbine Flat Wire Spring

Strike Industries AR-15 Carbine Flat Wire Spring
  • Spring Material: Cryo-cycled 17-7 PH steel
  • Packaging: single
  • Installation: drop in
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The Strike Industries AR-15 Carbine Flat Wire Spring uses incredibly sturdy material to create a product that is both reliable and long lasting while still not breaking the bank. The spring is constructed to give you increased bolt load without requiring as much compression force as many of its competitors. That creates improved cycling reliability. The use of cryo-cycled 17-7 PH steel means it’s going to last a very long time and won’t show signs of compacting, even with constant use in rapid firing situations. It’s highly heat resistant, and it decreases the vibration and harmonics typically found in AR style rifles and their buffer springs. This again aids in reliable performance.

Who Should Buy a Strike Industries AR-15 Carbine Flat Wire Spring?

The Strike Industries AR-15 Carbine Flat Wire Spring is a perfect choice for those looking to reduce distraction from the natural twang of the AR, as well as those who want less vibration so you can fire faster. If you’re looking for something that won’t corrode easily, this could be the buffer spring for you.

Pros

  •  Low vibration and little twang
  • Made of high grade steel for longevity
  • Handles increased bolt load

Cons

  • Could cause short stroke without full power

Conclusion

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Which buffer spring for 300 Blackout rifles is going to work best for you depends on your needs, the way you’re using your rifle, and what you’re willing to spend. In many cases, you’ll simply want a backup in case you need it, and in those instances, a low cost option to carry with you is viable. For some, customization of your 300 Blackout rifle means needing to meet certain specifications that require a greater investment. Also, tactical and competitive applications may require materials to be higher grade for heat resistance. Keep this in mind as you choose the best buffer spring for your 300 Blackout firearm.

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