May, 18

Build Your Own AR-15: Step-by-Step Guide for Beginners

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If you are a gun enthusiast with an interest in assembling your own firearms, the AR-15 is a popular firearm to build. The AR-15, also known as the "black rifle," is a semi-automatic weapon that has been used by military personnel and civilians alike for decades. Building your own AR-15 can be both challenging and rewarding, but it's important to approach this project with caution.

Assembling an AR-15 requires careful attention to detail and knowledge of the various parts involved. There are many different components that make up an AR-15 rifle, including the lower receiver, upper receiver, barrel assembly, bolt carrier group (BCG), buffer tube assembly (BTA), trigger group assembly (TGA) and more. Each of these components must be carefully selected and installed for optimal performance.

In this article on how to build an AR-15 from scratch: we will explore each component in detail; discuss tools required for assembling; talk about tips on buying high-quality parts when building from scratch or using pre-made kits; highlight potential legal issues surrounding building firearms at home as well as safety measures that should be taken during construction process.. Read on!

How to Build an AR-15: A Step-by-Step Guide

If you're looking for a reliable, customizable rifle that can be used for target shooting, hunting or self-defense, building your own AR-15 may be the way to go. While it may seem overwhelming at first glance, building an AR-15 is not as complicated as it initially appears. In this article, we will walk you through the process of building your own AR-15.

Benefits of Building Your Own AR-15

There are many benefits to building your own AR 15 rather than buying one pre-built from a manufacturer:

  1. Customization – You can choose every component that goes into your rifle and create a truly unique firearm.
  2. Cost savings – Building an AR 15 yourself can save you money compared to buying one outright.
  3. Knowledge and experience – Learning how each part works together allows gun enthusiasts deeper knowledge about their firearms.

Tools Required

Before starting on any project such as this there are some tools required:

  • Armorers Wrench
  • Vise
  • Screwdriver Set
  • Punch Set
  • Needle Nose Pliers
  • Torque Wrench

Steps in Building Your Own Ar 15

Step One: Choose Your Lower Receiver

The lower receiver is the only part legally considered a firearm so choosing wisely is important when selecting which lower receiver best suits your needs because everything else will depend on its size and shape.

Step Two: Install Lower Parts Kit (LPK)

Once you have chosen the lower receiver it's time to install parts kit or LPK if not already assembled; care must be taken with this step since improperly installed components could lead build failures further down line.

Step Three: Attach Trigger Guard And Buffer Tube Assembly

This step involves installing two more critical pieces before moving forward with upper assembly – trigger guard should fit snugly around magazine well while buffer tube assembly is vital for securing the stock.

Step Four: Install Fire Control Group (FCG)

This step involves installing fire control group or FCG and requires attention to detail since this is responsible for how trigger feels when fired. There must be no wiggle room between the FCG and receiver otherwise it could cause malfunctions.

Step Five: Choose And Attach Upper Receiver

The upper receiver attaches to lower one ensuring that all connections are tight as any looseness here could lead to misfires later on down road. Once attached, it's time add barrel assembly plus gas block front sight base before finally attaching handguard over them both; make sure everything lines up properly before tightening screws/bolts into place.


Building your own AR-15 can be a very rewarding experience, but it does require patience and attention-to-detail throughout each step of the process. By taking your time with each component installation, you can create a firearm that's customized just for you with all the features you want in an AR-15. However, if done improperly this could have consequences so proceed with caution!


What are the basic parts needed to build an AR-15?

Building your own AR-15 can seem like a daunting task, especially if you’re new to firearms. However, it’s actually quite simple once you understand the basic components involved.

The key pieces of an AR-15 include: upper receiver (which houses the barrel and bolt), lower receiver (which houses the trigger assembly and magazine well), bolt carrier group (BCG), barrel, gas block/tube, handguard/rail system, stock/brace and buffer/tube/spring assembly.

When building your own AR-15 from scratch or upgrading certain components on an existing firearm, it’s important to select quality parts that will work together seamlessly. Always make sure each part is compatible with one another before purchasing or attempting installation.

How do I choose a barrel for my AR-15 build?

The barrel is one of the most important components of any gun – including your newly built or upgraded AR-15. It plays a huge role in accuracy and reliability performance.

When selecting a barrel for your build project there are several things to consider:

  1. Length: The length of barre you choose largely depends on how you’ll be using it. For example: longer barrels provide better accuracy at longer ranges while shorter barrels provide better maneuverability in close-quarters combat situations.
  2. Twist rate: This refers to how quickly rifling inside the bore twists as bullet travels through it – measured as 1 twist per “X” inches”. Faster twist rates generally work best with heavier bullets.
  3. Material & Finish: You can find many types materials used in making barrels such as stainless steel or chrome moly vanadium steel which offer different levels durability against corrosion resistance .
  4. Contour / Profile : Depending on intended use ,the contour determines weight distribution while profile affects heat dissipation during rapid firing .

Ultimately choosing any component should involve research,reviews from forums and use cases of the barrel to ensure best fit for your needs.

How do I assemble the upper receiver?

Assembling an AR-15’s upper receiver is generally considered the most difficult part of the build process due to its intricate design. However, it's still something that can be done with proper research and patience.

Before you begin assembling, make sure you have all necessary parts including: a stripped upper receiver, bolt carrier group (BCG), charging handle,rail system, gas tube/block & barrel.

The general steps involved include:

  1. Installing forward assist into Upper Receiver – this ensures shooter may force round into firing chamber should it get stuck.
  2. Install Dust Cover Assembly – which keeps dust from getting inside gun
  3. Slide Barrel nut onto Upper Receiver – torquing(20-80lbs/ft )this tight ensures handguard properly fits on later
  4. Drop in Barrel –ensure properly seated in place as per manufacturer specifications
  5. Install Gas Tube/Block & Handguard/Rail System– this enables gas from fired round returning through to action cycle .
  6. Mounting Charging Handle & Bolt Carrier Group – slide charging handle inside opening at rear end of rail ,then install BCG by sliding in behind charging handle until latches engage .

This is just a basic guide; It is recommended reviewing more detailed instructions or videos before attempting any installation yourself

Are there any legal requirements when building my own AR-15?

When building or upgrading an AR-15 rifle one question people often ask is regarding legal requirements. Most states do not require registration when purchasing firearms components such as barrels or lower receivers but certain legal considerations must be made before completing your build.

Firstly,you must confirm eligibility under federal laws such as age limit required for ownership and not being prohibited person .You also need to ensure compliance with state laws regarding firearm ownership,purchase/license .For example some states may limit barrel length, ban certain muzzle devices, or require registration of certain firearm models.

Lastly, if you plan on building a short-barreled rifle (SBR) or fully automatic firearm (machine gun), you will need to apply for and obtain appropriate licensing through the Bureau of Alcohol,Tobacco and Firearms (ATF).

It is suggested to educate yourself on your states laws regarding firearms before proceeding with build.

What tools do I need to build an AR-15?

When assembling an AR-15 from scratch ,you require several specialized tools that make life easier.These include:

  1. Armorer's Wrench – used for tightening and loosening barrel nuts
  2. Barrel Vise – Secures Barrel while attaching handguard/Rail system
  3. Upper Receiver Vice Block – Aids in holding upper receiver while mounting parts
  4. Punch Set – Helps install roll pins & detent springs without damaging surrounding areas.
  5. Torque wrench – Tightens parts as per manufacturer specifications
    6.Bolt Catch Roll Pin Punch – Specific punch needed when installing bolt catch .
    7.Brass Hammer – Used to tap pins into place without marring finish
    8.Rubber Mallet – Use it along with Receiver pin punchesto avoid damage .

You can purchase all-in-one tool kits online that come complete with many of these necessary components; alternatively,some specialized items can be rented from some local gunsmiths if purchasing them is not feasible.

While it’s possible to assemble an AR-15 using fewer tools than listed above always ensure best practices are followed when handling firearms during assembly process .

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