Make Custom AR-15

The Simple Steps to Make A Custom Gun | Make Custom AR-15

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How To Make A Custom Gun?


While talking about a custom gun, we’ve got many topics to explore. Building an AR-15 rifle from the start is indeed an exciting process. At times, you might never understand how a weapon is made, but we are here to help you!. Now, we’re going to see how a custom AR-15 is created. We shall talk about the appeal of making a custom gun in this blog. Since there are different types of ARs and Calibers available, you may be confused on how to build an AR-15. Understanding is what you need before making the perfect weapon!

The Parts To Create The Firearm

The Custom AR-15 comprises of two major parts:

  1. The Lower receiver assembly
  2. The upper receiver assembly
How To Make A Custom Gun
How To Make A Custom Gun

The Upper Receiver Components

If you acquire a kit for building an AR-15, the upper part comes pre-built most of the time. In turn, the weapon building process becomes simple. Below is the list of tools that belong to the upper receiver part

  1. Bolt Carrier group
  2. Stripped upper receiver
  3. Charging Handle
  4. Gas Tube
  5. Gas Block
  6. Barrel
  7. Hand Guard

The Lower Receiver Components

Earlier, we saw what’s there inside in the upper part. Now we shall know what the lower receiver is made of:

  1. Stripped Lower receiver
  2. The Trigger assembly
  3. Buffer
  4. Buttstock
  5. Buffer tube and spring

The Selection Process

The upper receiver elements are known to be very significant in making a custom gun. It helps you to shape your weapon in the best possible way, thereby contributing to immense effectiveness.


A barrel is known to be an essential part of a custom AR-15. It determines the precision, range, and the number of bullet rounds as well. While choosing a barrel, you need to notice the type of metal that is used. Better prefer steel to get an excellent end product.

The Material

The AR-15 barrels are created using three different types of steel:

  1. 4140 Chromoly
  2. 416R Stainless steel
  3. 4140 Chromoly Vanadium (CMV)

But most weapon makers seem to choose 4150 Chromoly Vanadium. It is because this material matches the standards of a military rifle. The 416R stainless steel barrel is known to be the most sought-after variant.


Once the weapon assembling is complete, perform the coating as well. A matte black finish is sure to be an exceptional choice. It is because your arm gets saved from external factors such as rust corrosion. But if you are using a stainless steel barrel, make sure that you clean the Firearm regularly.


Velocity is a vital segment for a weapon to function well. To get the right level of velocity, you have to use a 16-inch barrel. You can get an approximate 2,940 FPS velocity by employing the Federal 62-grain 5.56 ammo.

Twist Rate

The twist rate of a custom AR-15 ranges from 1:12 to 1:7, and we recommend using a span of 1:7 or 1:8 to achieve decent rotation levels.

Gas System

For the AR-15 rifle, there are four different types of gas systems:

  1. Pistol
  2. Carbine
  3. Mid-Length
  4. Rifle

5.56 or .223 cartridges can be used for the gas length of AR-15 pistols too.

Attachment System

Keymod, Pitcanny, and M-Lok are the three various attachment systems to acquire. With such a system’s help, you can attach tools like the handguard, flashlights, lasers, and flip-up sights. To create a rifle that primarily has its focus on precision, use a flat-face handguard. In this, you can never find attachment points, thereby providing a smooth grip.

Buffer Assembly

It is the most crucial segment in weapon crafting. The Buffer assembly comprises Buffer tube, spring, and the buffer, which regulates the bolt carrier group’s recoil. Once you get to know all about the buffer assembly, you can get numerous information on building an AR-15 rifle.

The Final Assembly

Gather all the requirements to perform the ultimate assembling process and structure your gun. Acquire a Roll Pin punch set and Armorer’s wrench accordingly. Especially when you are about to install the buffer assembly, you’ll need an Armorer’s wrench. Both of these tools are equally important.

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