Build Your AR-15

How to Build an AR-15 Gun?

When you visit most FFL locations, you will find AR-15s of different quality at varying prices. On the other hand, you can build your very own AR-15 at a much lesser price. Building guns is not a super complicated process; hence why you don’t need high expertise. This page is a step by step guide on how to build your AR-15 gun. This procedure will consist of a few things to consider before building an AR-15, essential parts and accessories needed, and simple steps to make a fully functional AR gun.

What Should I Consider while Building an AR-15 Gun? 

Legality

Legality 

The ATF does not limit anyone from building a gun, including the AR-15. However, such guns are strictly for personal use only. Besides, you do not need an FFL or conduct background checks if you are using the 80% receiver. Nevertheless, anyone who uses a stripped lower receiver must do the proper paperwork with the authorities. State regulations about building guns vary. Therefore, you should review such laws before you build your AR-15.

Cost of Parts

Cost of Parts 

You must have a clear idea of the specifications you need on your AR-15 and have an appropriate budget. Have a precise approximation of the total amount of money you will spend to purchase all the parts and accessories. The intended use of your AR-15 is also something that will influence your budget. Go for affordable deals, but don’t compromise the quality of the parts needed.

Cost of tools

Cost of tools 

You will need particular tools while undertaking your project. How much will the tools cost you? If you already have some of the tools with you, it will cost you less. If you want to make a quality AR-15 gun, you need the right tools. Hence, you need to invest in what tools you currently do not have and must purchase.

Time Required to Complete the Project

Time Required to Complete the Project 

Time is a vital factor while you build your gun. Other minor things will probably affect the time of completion of your project. Including the period it takes to gather all the parts, your commitment to other things such as your job, hobbies, proficiency of tools used, etc. Research how to carry along the process and schedule your project appropriately.

Essential Parts of an AR-15

There are significant components a standard AR-15 must contain irrespective of any customization done on it or its caliber. These parts are the upper receiver assembly and the lower receiver assembly. There are also multiple accessories compatible with the AR-15. Let’s look into specific pieces essential to building your AR-15.

The Upper Receiver Assembly

The Upper Receiver Part contains the following components:

Bolt Carrier Group(BCG)

Bolt Carrier Group(BCG)

Handguard

Handguard

It comes into two types, i.e., drop-in and the free-float. Free-float does not attach to the barrel or gas-block while the drop-in connects to the gas block or front part of the sight. Three attachment systems allow you to attach other accessories. They are M-Lok, Keymod, and Picatinny.

Barrel

The barrel is quite a significant component while building an AR-15 or any gun as it determines several things, such as the accuracy of your weapon and the ammunition size you will use.

While selecting a barrel, evaluate the material, finish, twist rate, and length of the barrel for your personalized gun.

AR-15

Barrel

Barrel

Stripped upper receiver

Stripped upper receiver

Gas tube

Gas tube

Charging handle

Charging handle
  • Most of the Upper Receivers are made of billet 6061 T6 aluminum or forged 7075 T6 aluminum.

NOTE: From a legal perspective, the upper receiver is considered the firearm. This law’s reasoning is due to the operation of the action in the receiver as it is independent and needs to have a serial number. 

Which Are The Different Types Of AR Upper Receivers? 

There are three types of upper receivers one can use when building an AR-15. First, the primary upper receiver that is characterized by its lightweight and lacks the forward assist. Second, the A2 Upper Receiver is characterized by an integrated rear sight and a handle. Finally, the M4 Flattop Upper is characterized by traditional Picatinny rails. It is the most common striped upper while making custom AR-15s or building your own.

 

The Lower Receiver Assembly 

The market offers the lower receivers in four different variations. They include the polymer lower, billet aluminum lower, forged aluminum lower, and the cast aluminum lower.

Any part of the lower receiver must contain the following components:

Buffer Tube

Buffer tube

Buffer spring

Buffer spring

Buffer

Butt Stock

stripped lower receiver

80% lower receiver or stripped lower receiver

Lower parts kit with trigger assembly

Lower parts kit with trigger assembly

Such a kit should include Grip, trigger, magazine catch, safety, hammer, bolt catch, takedown pins, and buffer retainer.

NOTE: If you choose the stripped lower receiver over the 80% lower receiver, you will have to do a background check, pay an extra fee, and also pay an additional tax. Also, it affects the time scheduled to build your AR-15 since you will have to wait for an extended period.

AR-15 Accessories

These are smaller components you can fix on your AR-15 to enhance its effectiveness and performance. Also, they are used to replace the standard components while customizing your AR-15.

They include the sling plates, slings, custom grips, sights, optics, lasers &lights, custom stocks/ braces, muzzle devices, recoil pads, and vertical/angled grips.

NOTE: Some accessories are not allowed in some locations. As mentioned above, you should be aware of the regulations within your state.

AR-15 Accessories

A Brief Guide To Help You Build Your AR-15

Once you have considered the above factors and you have all the necessary parts and tools, you can start the exciting task of building your gun. Ensure all your parts are arranged in groups, as discussed in the above three categories before you even think of kicking off.

The following points will guide you through:

Assemble your forward assist on your upper receiver

  1. Install the ejection port cover
  2. Assemble the bolt carrier group
  3. Install the bolt carrier and charging handle into your upper.
  4. Fix the barrel in the threaded side of your upper
  5. Guide your outer receiver nut on the thread till it reaches the ejection port cover pin
  6. Then, attach your inner barrel nut and tighten them.
  7. Insert your gas tube into the upper, outer, and inner with three holes at the end. This will be where you place your block.
  8. Loosen the screws on the bottom of the block and thread the tube into the block.
  9. Insert the roll pin into the block and tube. However, ensure the whole set up is tightened very well.
  10. Now, you built your AR-15, but you need to add the above-discussed accessories. At this step, you can customize most of the components of your AR-15.
  11. It’s time to test your firearm. Shoot several rounds at different ranges to evaluate its performance and effectiveness while shooting.

Disclaimer

The above information is not to be interpreted as legal advice. In case you have any questions regarding legal issues, consult an attorney before build your AR-15. You are liable for your actions while building a firearm. Hence, ascertain and obey all applicable local, state, and federal laws.