There are many factors to consider when deciding how to build a 300 Blackout rifle. Some of the most important features to consider include the barrel length, short stubby case design, and using lighter buffers. You can also decide which gas system to use. Here are some suggestions to help you get started. We hope you find our guide useful. We’ve put together some important points to get started on your 300 Blackout.
Short stubby case design
The short stubby case design of the 300 Blackout allows it to be used with rifles and AR platform pistols with shorter barrels. Its higher grain design enables it to use subsonic bullets that would otherwise fail to achieve the required speed. A 300 Blackout case is also switchable, making it easy to switch from subsonic to supersonic ammunition without risk of malfunction.
The ideal barrel length for the 300 Blackout is nine inches. This allows the bullet to burn powder evenly, while allowing for the suppressor device’s length. This is the ideal length for subsonic rounds, but remember that your suppressor device can increase the amount of powder burn by several inches. The propellant inside of these rounds is the same as that used in subsonic rounds, so the length of the barrel must be adjusted accordingly.
The barrel length for the 300 Blackout should be at least 16 inches, depending on your objectives. For example, if you want to use the 300 Blackout for long-range hunting, you can build the barrel length accordingly. You can also use the 300 Blackout as a hunting rifle to shoot supersonic loads, which have maximum muzzle velocity of about 626,000 fps. Once you’ve found the length you like, you can add a scope, or add a suppressor.
Using lighter buffers
You can build a blackout rifle using lighter buffers, but there are a few things you need to take into account. For one, a 300 Blackout has a heavier cartridge, so it needs a lighter buffer. The same holds true for the gas system, which can be finicky with this rifle. You will want to choose the best spring to minimize gas system problems and maximize the suppressor’s effectiveness.
While the H2 buffer is a good place to start, you should avoid using this for a subsonic.300 BLK cartridge. It’s also too heavy to fit in an upper assembly designed for 5.56 NATO. The H buffer, at 3.8 ounces, has two steel and one tungsten weight. The buffer is also suited for pistol-length gas systems. Ultimately, you should use the H buffer if you’re planning to shoot 5.56 NATO and 7.62×39.
Choosing a gas system
When building a 300 Blackout rifle, a good gas system is one that can handle supersonic loads. Supersonic loads will not cause the gun to cycle as reliably as subsonic loads. If you’re building a gun with a short barrel, you may consider a pistol length gas system. Depending on the length of the barrel, a pistol length gas system can be more reliable than a rifle with a long barrel.