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If you’re searching for the best 300 Blackout buffer springs, I feel for you. It can be tricky to tune your 300 AAC rifle to run reliably with all the different types of 300BLK ammo that you can get.
It can be tricky to find a one-size-fits-all 300 Blackout buffer spring solution. But we’ve put together the most comprehensive list of the best 300 Blackout buffer springs on the market.
That way you can get the best spring that delivers reliable operation.
Top 300 Blackout Buffer Springs on the Market
Our Best Choice
Aero Precision AR15 Carbine Recoil Buffer Spring
SPOILER—it might not be the end-all-be-all of 300 Blackout buffer springs. But you can’t go wrong with the Aero Precision AR15 Carbine Recoil Buffer Spring. It’s super affordable. And it’s a solid buffer spring that reliably delivers standard AR-15 spring forces.
So will most likely give you a working rifle. But it’s also easiest to tune the other parts of your gas system if your buffer spring is standard.
If you’d like something fancier or that’s more specifically designed for running 300 Blackout, keep reading. We’ve got a whole bunch of the best 300 Blackout buffer springs ready for you to check out.
The Best 300 Blackout Buffer Springs Reviews: Put Some Spring in Your 300BLK Step
The overall best 300 Blackout buffer spring will get compressed first. The other best 300 Blackout buffer springs will be sprung in order of price.
Looking for the most affordable 300 Blackout buffer springs? Read the first reviews.
Looking for the most whiz-bang, high-performance buffer spring, no matter the cost? Check out the reviews near the end.
Let’s bounce some springs.
1. Aero Precision AR15 Carbine Recoil Buffer Spring - Overall Best 300 Blackout Buffer Springs
The Aero Precision AR15 Carbine Recoil Buffer Spring is one of my go-to buffer springs for any AR-15 builds. It’s affordable. And it reliably produces standard recoil spring force.
It’s a stainless steel spring. That’s pretty much the industry standard for buffer springs. It’s strong and reasonably corrosion resistant, even though there’s no corrosion resistant finish.
I’ve found that it holds up well, even if you often shoot suppressed, which pushes a lot of gas back into your buffer tube.
This is the carbine length buffer spring. So it will work with the most common buffer tube setups.
Overall, this buffer spring is nothing special. But it’s super affordable and durable. And it gives you a standard AR-15 spring to work with if you need to tune your gas system.
2. Nemo Arms 300BLK Custom Carbine Buffer Spring - 300 Blackout Buffer Spring
The Nemo Arms 300BLK Custom Carbine Buffer Spring is pretty much the only buffer spring designed specifically for the 300BLK round. That comes with some ups and downs, interestingly enough.
First, the good stuff.
This spring is designed specifically for shooting 300 Blackout with a carbine length gas system. That gives you a lot of flexibility for barrel length, since a carbine length gas tube is super short.
Additionally, the spring stiffness is slightly lower than a standard AR-15 buffer spring, which is ideal for shooting subsonic ammunition. That way your rifle can operate, even if the gas system is tuned for supersonic ammunition.
But this is still a stainless steel spring, which produces strong enough corrosion resistance for frequent suppressed shooting.
Here’s the catch:
The lower stiffness may cause you reliability issues with supersonic ammunition. Or, if your rifle operates with supersonic ammunition, you may get some bolt bounce.
But, if you plan on taking advantage of 300BLK for shooting suppressed or with short barrels, this Nemo Arms buffer spring will give you a spring that’s tuned to accommodate 300 AAC.
3. Strike Industries AR Carbine Flat Wire Spring - Budget 300 Blackout Buffer Spring
The Strike Industries AR Carbine Flat Wire Spring is a super economical way to upgrade your buffer system for shooting 300 Blackout.
All the standard features are in place.
This is a stainless steel spring to resist corrosion. And it’s been stress relieved to ensure that the spring force is consistent across the entire compression cycle. The stress relieving also gives this spring a longer lifespan, even in rifles with high cyclic rates.
Then there are non-standard features.
This spring uses a flat-wire rather than a round wire. That might sound insignificant.
However the flat wire construction also helps this spring deliver more forward force without increasing the spring stiffness. That way your rifle recoils properly and reliably goes back into battery, regardless of how strong your ammunition is, subsonic or otherwise.
Additionally, the flat wire construction reduces vibration and spring noise. That makes it easier to make fast follow-up shots and makes your rifle more comfortable to shoot.
Overall, this Strike Industries spring performs notably better than a standard round wire spring. And it’s not much more expensive than a quality round wire spring. So it’s a very affordable upgrade to your rifle’s shootability and reliability.
4. JP Enterprises AR-15/M16/308 AR Tuned Buffer Spring - Value 300 Blackout Buffer Spring
The JP Enterprises AR-15/M16/308 AR Tuned Buffer Spring is another one of my go-to buffer springs, especially if I want a smooth recoil impulse.
This spring is kind of a hybrid between a round wire spring and a flat wire spring.
It’s a stainless steel round wire spring, with flattened sides that mimic flat wire spring operation.
Additionally, this spring is centerless ground and tuned to deliver a smoother recoil impulse and more consistent spring force.
The spring is also polished to reduce spring noise. It’s not a huge deal. But this spring makes your rifle more pleasant to shoot.
However, the big deal is that this spring is tuned to work with low mass bolt carrier groups. In a standard AR-15, this just means that this spring is good for lightweight rifles.
In a 300 Blackout rifle, the tuning means that this spring will work reliably with subsonic ammunition.
This JP Enterprises spring is a legitimate reliability upgrade for your 300 Blackout rifle, that also makes it more shootable. It’s easily more than worth the price.
5. Geissele AR-15 Super 42 Buffer Spring/Buffer Combo For Carbine Receiver Extensions - High Reliability 300 Blackout Buffer Spring
The Geissele AR-15 Super 42 Buffer Spring/Buffer Combo For Carbine Receiver Extensions are constructed differently than any other buffer spring out there, which makes them more durable and longer lasting than other buffer springs.
The main thing about this buffer spring is that it’s constructed from 3 separate wires. The wires are wound together and turned to create a single spring.
This might sound like hogwash. There are a few benefits to the design, though.
First, the spring produces more forward force for driving your bolt into battery. But this spring isn’t any stiffer than a standard AR-15 spring. So your bolt carrier recoils as freely as it does with a standard AR-15 spring.
Therefore, this spring enhances your rifle’s reliability, even with subsonic or low-quality ammunition.
Additionally, the 3-wire design helps dissipate excess energy and reduce spring noise. There’s less last round “twang” when your bolt locks back. It’s not entirely gone. But it’s significantly reduced.
Lastly, this spring is constructed from stainless steel with a corrosion resistant coating. So this spring delivers a remarkably long lifespan.
Admittedly, this Geissele spring is pretty expensive for just a recoil spring. But the performance and longevity are outstanding. So it’s actually worth the higher price.
6. JP Enterprises Gen 2 Silent Captured Buffer Spring System - Recoil Reduction 300 Blackout Buffer Spring
The JP Enterprises Gen 2 Silent Captured Buffer Spring System is the only recoil spring system that significantly improves your recoil impulse and eliminates almost all spring noise.
That’s because this isn’t just a recoil spring. It’s a complete recoil system that also replaces your buffer.
This system comes with a few different buffer weights. Most shooters find that the H1 buffer works best for 300BLK. But you may need a different weight, depending on your gas system.
I recommend getting this system with the 5 pack of springs. That way you have everything you need to tune your recoil system if you’re having trouble.
Anyway, this system makes your recoil impulse super smooth. It’s super easy to take quick, accurate follow-up shots.
And, since the spring is captured in the system, there’s no last-round “twang” or buffer spring noise at all. It makes your rifle as comfortable to shoot as possible.
The main trouble with this buffer system is the price. This thing is expensive. But I’m accustomed to seeing really expensive stuff from JP Enterprises.
However, the recoil impulse and lack of buffer spring noise is actually worth the money. There’s just no other recoil spring or recoil system that produces a more pleasant shooting experience than this one.
A Better Buffer System
Buffer springs are a slightly bigger deal in 300 Blackout rifles because the gas systems can be finicky. So it’s wise to get the best buffer spring that you can afford on your budget to minimize gas system issues and tuning. To better enhance it's performance, you can combine it with a well-built and high quality suppressor.
Aero Precision AR15 Carbine Recoil Buffer Spring
If you need a solid buffer spring that’s both affordable and gives you a reliable baseline for your 300BLK gas system, get the Aero Precision AR15 Carbine Recoil Buffer Spring. You may have to tune your gas system. But this spring gives you predictable spring performance to make things as easy as possible.
Now that you know, stop struggling with cheap buffer springs that underperform. Get a good buffer spring and get a 300 AAC rifle that runs reliably.