300 Blackout Pistol Build Tutorial

Remarkably, the most standout characteristic about the 300 Blackout pistols is they can offer a wider range of projectile choices. Also, the 300 Blackout belongs to today’s best AR cartridge for a number of good reasons. More than that, the 300 Blackout boasts an extraordinary life system because of its lower operating pressures that give way to much lower lifetime maintenance. That truly gives a reason to be amazed by 300 Blackout, right?

Despite the fact that factory-complete takedown pistols are less hassle to have, many opt for trying to build their own. Hence, the reason for the popularity of the 300 Blackout pistol build tutorial. The good thing is that the market is also well aware of the demand for high-quality 300 Blackout build kits and lower parts kits for the build. That said, there is not much trouble to encounter when it comes to building and modification. 

Let’s get to know more about the 300 Blackout to learn about how to build better. 

What is 300 Blackout?

The .300 AAC Blackout, more popularly known as the 300 BLK, is technically a rifle round that the Advanced Armament Corp. develops for the U.S. military’s special operations. Impressively, it is an alternative to the 5.56 round with a low power and inability flaw. As a new round, the 300 BLK was utilized to work with existing military rifles, such as M4 and M16, even without modifications. 

Compared to the 5.56 round, there is not much significant difference between a 556/223 AR-15 and a 300 BLK AR-15, given that they have the same barrel length. Thanks to its short casing, the 300 Blackout can effectively facilitate the power to burn quickly and permits the gas to build up much more effectively at the same time. The quality of the short casing is one of the edges of the 300 Blackout over the 5.56×45mm round, promoting much greater muzzle energy.  

Much greater muzzle energy means greater potential for lethality. Another advantage of the short casing and the short stubby case design is that it has more capacity to hold a much higher grain bullet than the 5.56×45mm round. Besides that, its impressive casing allows the 300 Blackout projectiles to have bullet energy superior to other rounds. Meanwhile, the bulky build of 300 Blackout guarantees that it can shoot more with more barrier blindness, having the power to go through thin walls without losing much bullet energy. 

300 Blackout Pistol Build Guide

If you have an existing AR-15, it is a great starter to have your own 300 Blackout pistol build. As a matter of fact, you will only be required only primary components to be swapped, such as the barrel and gas system. Yet, if you are truly dedicated to building your 300 BLK AR-15, you must swap more than just the barrel and gas system. 

Here are the components you can swap: 

• Lower parts kit
• Lower receiver
• Carbine buffer tube and buffer assembly
• Trigger assembly
• Upper receiver
• Stock/Pistol stabilizing brace
• Bolt carrier group
• Magazine
• Handguard
• Barrel nut for barrel
• Any additional accessories (flashlight/mount, foregrip, iron sight, optic/red dot, etc.)

Best Gas System for 300 Blackout

Regarding gas systems for AR-15 models, the length has a wide variety, including rifle, intermediate, mid, carbine, and pistol. The shortest ones are the pistol length gas tubes, which are about four inches long. Carbine length gas tubes have a length of about seven inches long. Meanwhile, the mid length gas tubes measure about nine inches long. 

Moreover, the intermediate gas tubes measure about 11 inches long. The rifle gas tube lengths are considered the longest of the gas systems, with about 12 inches in measurement. Of course, the choice depends on the type of 300 blackout rounds you fire. Yet, if you want to build a weapon that is convenient to carry and can effectively fit in a suitcase for traveling, pistol length makes a good choice. 

In addition, the pistol length is also an excellent choice for subsonic rounds. This length permits the short barrel to be joined with a nice suppressor without having trouble because it does not extend the overall length of the gun too much to worry about. Simply put, the pistol length of the gas system is the best compatible with subsonic rounds because shooting them would be too long with inadequate pressure in carbine length gas systems. 

Instead, the carbine length gas systems will work best and be highly compatible with supersonic rounds. Another relevant piece of information to remember is that the bigger the bullet grain, the less energy will be available for recoil. Besides that, too long of a gas system can divert the pressure. That’s considered the primary reason why a longer gas system can be insufficient for some applications. 

Best Barrel Length for 300 Blackout

In terms of the best barrel length for 300 Blackout, 9 inches is considered the best because it is also the most common barrel length. Well, it is the most commonly used for good reasons. Primarily because it is an optimal length that can guarantee the powder has completely burnt up when firing. Of course, you can always go for a longer barrel length, but it doesn’t mean it is a good choice.  

To be fair, a longer barrel length also comes with impressive perks, such as guaranteeing greater muzzle energy. Realistically speaking, the 300 Blackout firearm is purposely built for an effective range of up to 300 yards at most. That’s why there is nothing wrong with settling to 9 inches barrel length. Ultimately, switching to a different caliber is more practical and economical than using a longer barrel.  

What’s impressive about the 300 Blackout is that it can work with a shorter barrel with no compromise terminal ballistics. A little shorter to 9 inches, such as 7.5 or 8 inches, will not have you experience inferior performance compared to a 9 inches barrel. You can expect such lengths to still ensure perfectly fine for shooting 100 yards to 200 yards. If you are shooting at a short distance, a shorter barrel can satisfy you, as it can ensure better maneuverability. 

Best Barrel Twist Rate for 300 Blackout 

When it comes to the twist rate for 300 Blackout, the faster the twist rate is, the more effective it is concerning stabilizing heavier grains, such as subsonic 300 Blackout rounds. In a 1:7 twist rate, you can expect the rifling can effectively make one full rotation every 7 inches of barrel length. That’s already obvious in the name, as well. Sounds interesting to know, right? 

As for the best twist rate, there is no definite choice for that. In reality, the best twist rate for a 300 Blackout depends on the bullet grains that will be shot along with it. In short, it is another case-to-case basis decision. One thing you must bear in mind regarding twist rate is that the one that suits subsonic ammo the most will probably not be the best choice of twist rate for supersonic ammo because it will not perform optimally, and that’s also vice versa. 

If you don’t want to struggle with extreme scenarios, you better pay attention to the twist rate for your 300 Blackout. This means that you must be aware of the bullet grains you will be shooting most. Unless you choose the right twist rate, you can either have trouble with overstabilization or having not enough spin. Of course, a bullet that either spins too fast or too short is a problem in shooting performance, and won’t give you the shooting result you want. 

1:7 twist rate is best for 300 Blackout subsonic

Ideally, the 1:7 twist rate is known as the best choice for 300 Blackout subsonic. In fact, the majority of the 300 Blackout barrel manufacturers also have chosen this twist rate since it has the best ability to stabilize most of the 300 Blackout ammunition and subsonic rounds. One vital thing you need to be mindful of about this twist rate is its flaw in dealing with shooting low-grain ammo—there can be the risk of overstabilization. 

1:8 twist rate is best for 300 Blackout supersonic

Once again, the twist rate dedicated to the subsonic is not the best choice if you like to shoot more supersonic ammunition. In that case, the twist rate that would work the best would be the 1:8 twist rate barrel. Its well-known twist rate works great with rounds below 75 grains. If the 1:7 twist rate barrel is popular with manufacturers, this one is popular with competition shooters, thanks to its accuracy counts. 

Undeniably, you won’t see the 1:8 twist rate barrel as much as the 1:7 twist rate barrel. Nonetheless, it is also hard to deny that this twist rate has its own appeal, capacity, and perks that contribute to its prominent reputation and popularity. 

Best Stabilizer and Buffer for 300 Blackout

In the market, you will see overwhelming options for stabilizer offerings and buffer assembly. Besides working on the stabilizer and buffer, some gun enthusiasts have tried using a collapsible stock on the 300 Blackout pistol build. When choosing a stabilizer, you must look for one that is jam-packed with superb features, such as lightweight, slim profile, ambidextrous QD points, and set-screw locking for secure position adjustments. 

Now, if you don’t want to mess up your 300 Blackout pistol build, you must also pay great attention to buffer assembly. Thus, you won’t have to deal with any mistakes later on. Ultimately, a pistol especially requires special attention in building more than a carbine. You can splurge a little when choosing the best components to guarantee to achieve the desired results. 

Best Optics for 300 Blackout

Whether you go for a budget-friendly theme for your 300 Blackout pistol or not is up to you. Luckily, even if you go for any theme, you can actually see some optics that will go to your budget. Of course, you must remember that you will get most of what you pay for as value and costs. For instance, when you choose budget-friendly optics, you might have to deal with minor frustration in sightings. They can be annoying, but they still make a great bargain for their price. 

On the flip side, if you have some money to spare for your optics, you will be amazed by the kind of optics you can buy for your 300 Blackout pistol build. Surely, you can always see optics, such as a red dot sight that comes with impressive adjustable brightness, fog-proofing, waterproof and shockproof construction. In short, just have a budget in mind, and you will most likely see a more narrow range of options. 

Best Upper Components of 300 Blackout 

If you are a beginner in terms of 300 Blackout pistol build, you probably don’t want to experience much trouble, right? If so, it will be more practical and helpful to just have complete upper components in one package. What comes with the complete package includes the barrel, handguard, bolt, charging handle, and other vital upper components. 

Fortunately, if you like to reduce your workload in working with the 300 Blackout pistol build, it would be excellent to just have a complete 300 Blackout kit. Good news, no need to search further because you can discover some of the best 300 Blackout kits to choose from. 

5 Best 300 Blackout Kits 

The best 300 Blackout build kits and lower parts kits on this list can help you complete an AR-15 build with confidence. As a matter of fact, these build kits can effectively surpass the standard and be the standard you need to achieve great work. 

Here you go, so explore what 300 Blackout build kits made it into the best list below. 

1. Palmetto State Armory Magpul MOE Lower Build Kit

Looking for components that can help you impressively finish building your lower receiver? If so, you don’t need to search further because the Palmetto State Armory Magpul MOE Lower Build Kit can give you exactly what you expect. From buffer tube assembly, safety selector assembly, magazine catch assembly, and fire control group to bolt catch assembly and takedown pivot & pin assembly. In short, it comes with everything you might need in order to effectively assemble your lower receiver with a stock. 

With a Black finish, most of the components included in this kit have a great look that you won’t worry about using for building your 300 Blackout pistol. Ultimately, this Magpul MOE Lower Build Kit is one of the most popular kits because it boasts components that are purposely built to deliver reliable and impressive performance when used. Thus, you can have great quality for its price that might exceed more of your expectations. 

Definitely, you couldn’t be happier when using this build. All you need to do is experience it to know how it can satisfy you. If you are curious about the exact components included in this build kit, just visit the link below. There, you’ll have a clearer idea of why it is in-demand as well. 

2. Palmetto State Armory Premium Classic Lower Build Kit 

You can never go wrong with the Palmetto State Armory Premium Classic Lower Build Kit if you are searching for components to have an incredible lower build. It would work great when used right. With superb details included, such as an A2 Pistol grip, PSA M4 Stock, PSA lower parts kit, and Mil-Spec diameter 6-position 7075 aluminum buffer tube assembly—everything to help you effectively finish your stripped lower.

Impressively, this lower build kit lives up to its name of being a premium classic one because most of the components are meant to impress with their durability and quality. Similar to other high-quality build kits, it also comes with everything, including fire control group components, buffer tube assembly, bolt catch assembly, safety selector assembly, magazine catch assembly, and other vital components. 

If you want to experience building an amazing weapon, this Palmetto State Armory build kit will never disappoint, and the best way to find out is by trying it. Don’t miss out on this build kit if you want a premium classic performance.  

3. PSA EPT MOE Lower Build Kit

With the PSA EPT MOE Lower Build Kit, you can upgrade the standard combat-style fire control group. You will like its fire control group components that come with polished contact surfaces and an electroless nickel coating. That amazing design and materials guarantee reliable durability and quality from the components. Meanwhile, the drop-in buttstock included in the package is purposely designed for light, fast action.

Moreover, this kit also features a superb drop-upgraded pistol grip from Magpul. With that being said, you can trust that it is of great quality. Besides that, the pistol grip can also ensure anti-slip and ergonomic advantages. The drop-in replacement trigger guard is an upgrade from the other standard trigger. Meanwhile, the buffer tube assembly won’t disappoint you with its function and performance. 

Definitely, the PSA EPT MOE Lower Build Kit can offer you all the standard necessities to effectively finish your stripped lower. You can utilize all those quality components to complete a pistol or AR rifle. That’s why you can expect that it is equipped with bolt catch assembly, magazine catch assembly, safety selector assembly, and other necessary components—just like the other high-quality kits. 

As always, this lower build kit is great value for your money. What’s more amazing is that it is always available at a discounted price so that you can save money and still have the same high quality that you can’t find from others. On top of that, all the necessary components included can cause you extreme happiness with the fit and finish. 

4. Palmetto State Armory Magpul MOE EPT Lower Build Kit

Interestingly, the Palmetto State Armory Magpul MOE EPT Lower Build Kit barely differs from other build kits on this list. This means it also boasts the necessary components to upgrade the standard weapon to a more high-quality one. The prominent characteristic that makes this build kit stand out from the others is its fantastic Flat, Dark Earth color. 

If you are tired of having a Black color weapon, you can utilize the components from this build kit to have something new for your weapon. Certainly, you will love the pistol or AR rifle you have built using the parts. This is a great starter if you want to start building your own gun at a cheap price. It will work great when used right. 

There’s no wonder that the Palmetto State Armory Magpul MOE EPT Lower Build Kit deserves to be part of the best list. You can try it if you want something new—like color—and still have the same quality. 

5. Palmetto State Armory Magpul CTR EPT Lower Build Kit

Even at no discounted price, the Palmetto State Armory Magpul CTR EPT Lower Build Kit already comes with great value. Yet, there’s no complaint that it is more tempting to catch it when on sale because you can have it at a lower price, but in the same quality. For that reason, you can genuinely appreciate its excellent value for your money. 

This is a classy lower build kit that you can purchase with vital components that work fine and are great for the gun you will build. Since all the necessary parts are of top quality, you don’t have to struggle to search for all the parts to upgrade your weapon because all of them are included in this one. All you need is to buy this build kit, and you can start working on building a nice gun you will actually like. 

From fire control group parts, Magpul CTR Stock, and MOE Trigger Guard to MOE Grip, and lower parts, you can look forward to a complete AR rifle or pistol building with no issue. So, if you want to try it, just check it out on the link below. 

Frequently Asked Questions

This FAQs section can help you know more about the 300 Blackout pistol build and other relevant details about gun building. Therefore, if you are interested in learning more, just explore the questions below. 

Final Thoughts 

While working on your own 300 Blackout pistol build sounds like an overwhelming task to complete, you can certainly overcome it. Thus, you will find DIY gun building just like Legos for adults. Of course, when you build your own 300 Blackout pistol, take advantage of the chance to use the best components to have a firearm that you can actually like shooting. 

Now, if you want to know more guides and reviews related to shooting and firearms, just dive deeper into the Survival Gear Shack website.