July, 16

AR 15 Assembly Guide: Step-by-Step Instructions for Assembling Your Own AR 15

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Assembling an AR 15 is a task that requires precision, patience, and attention to detail. This widely popular rifle has become the go-to choice for many gun enthusiasts and professionals alike due to its versatility and customization options. Whether you are a seasoned gunsmith or someone looking to build your first AR 15 rifle, this article is here to guide you through the process.

Building an AR 15 may seem intimidating at first glance, but with careful planning and preparation it can be done with ease. The assembly procedure involves fitting together various parts such as the upper receiver, lower receiver, barrel assembly, trigger group components among others. Each step needs careful consideration for proper function of your firearm.

In this article we will discuss in detail how to assemble an AR 15 rifle from scratch while offering tips on making informed decisions along the way so that you end up building something that matches your exact preferences without compromising quality or functionality. Read on for our comprehensive guide on assembling an AR-15!

Assembling an AR-15: A Comprehensive Guide

The AR-15 is a popular firearm among gun enthusiasts and hobbyists alike. With its easy customization options and reliability, it's no surprise that many people choose to build their own instead of buying one pre-made. However, if you've never assembled a firearm before, the process can be intimidating. In this guide, we'll walk through each step of assembling an AR-15 from scratch.

Why Assemble Your Own AR-15?

There are several benefits to building your own AR-15 rather than buying one off the shelf. First and foremost is customization – when you build your own rifle, you have complete control over every aspect of it. You can choose the exact parts and accessories that suit your needs and preferences without having to compromise on anything.

Another advantage is cost – depending on where you buy your parts from, building an AR-15 from scratch can be significantly cheaper than purchasing one already assembled.

Finally, assembling your own rifle can be a fun project for gun enthusiasts who enjoy working with their hands or want to expand their knowledge about firearms in general.

Required Tools

Before diving into assembly instructions, let's take a look at what tools will be necessary for this project:

  • Armorers wrench
  • Torque wrench
  • Vise block or Magpul BEV Block
  • Hammer/mallet
  • Punch set (1/16", 1/8", 3/32")
  • Receiver vise
  • Upper receiver vice block/clamp

A few optional but helpful tools include:

  • Bench vise

  • Dremel tool

  • Roll pin starter punches

Parts List

Assembling an AR-15 requires quite a few parts – here is what you'll need:

Lower Receiver Components

Part Description
Lower Receivers Stripped or complete lowers
AR-15 Lower Parts Kit Includes trigger assembly, pistol grip, selector switch and detents/springs
Buffer Tube Assembly Receiver Extension tube, castle nut, receiver plate and buffer spring/buffer

Upper Receiver Components

Part Description
Barrel and Gas System Including gas block/tube.
Muzzle Brake/Flash Hider Threads onto the muzzle of the barrel to reduce recoil or flash.
Handguard/Rail System Rail system surrounding the barrel for mounting accessories or sights.
M4E1 Enhanced Upper Receiver M4 feed ramps cut into its design for increased reliability in feeding rounds from a magazine in combat situations.

Step-by-Step Assembly Instructions

With your tools ready on hand and your parts list complete let's move on to assembling an AR-15:

Step One: Assembling The Lower

The lower receiver is made up of several small components that must be assembled correctly for everything to function properly. Begin by installing the magazine catch button (and spring if applicable), then attach it to the receiver using a roll pin punch.

Next up is installing the bolt catch assembly – slide it into place from inside ofthe left side until you can see both pins protruding outwards; use pliers as needed when pushing these through holes before securing with another roll pin punch.

Now install trigger group including hammer/disconnector springs whose coil end points toward its respective part then push down lightly onto plunger while aligning with slot in housing so that its tang fits under one leg situated at backside where two pins hold this whole setup tightly together providing stable platform around which rest any other component present on lower half part like safety selector lever detent/spring etc., Lastly fit stock "buffer" tube along with castle nut over thread ensuring proper alignment between them before tightening snugly using Armorers wrench.

Step Two: Installing the Buffer Tube and Stock

With your lower receiver fully assembled, it's time to move on to installing the buffer tube assembly. Start by threading the buffer tube into the back of the lower receiver until it's snug, then attach a castle nut onto it and tighten with an armorers wrench.

Next up is attaching your preferred stock to this assembly. Depending on what type of stock you've chosen there may be additional steps required – for example if using a collapsible buttstock you'll need to push down button allowing rod inside spring assembly come loose from its slot thus enabling adjustment via lever present at one end while holding other side firmly against shoulder area where cheek weld located.

Step Three: Assembling The Upper Receiver

Moving on to assembling upper receiver section now which includes barrel/gas block/tube/muzzle brake/flash hider handguard/rail system/M4E1 Enhanced Upper Receiver etc.,

Begin by installing forward assist button; slide into designated slot in uppermost part until protruding pin aligns properly from outside surface before screwing retaining clip plate over top securely with torque wrench helps ensure correct pressure applied so these components stay together during use.

Now fit barrel onto extension tube (making sure gas port holes line up between two parts), insert gas block above bottom-third position along lengthwise channel found underside then secure both using pins/punches as needed followed by threading muzzle brake/flash hider (if desired) over threads located at front end before securing everything else including handguard/rail system M4'E1 Enhanced Upper Receiver.


Building an AR-15 can seem like a daunting task, but with careful attention paid each step of way success within reach! Remember that having right tools/parts list makes all difference when undertaking such project so take care make sure everything fits together nicely before proceeding any further.


What is an AR-15?

An AR-15 is a semi-automatic rifle that is popular among gun enthusiasts and hunters alike. It has been in production for more than 50 years, and its popularity shows no signs of slowing down. The AR-15 platform was first created by the company Armalite, but it was later sold to Colt’s Manufacturing Company in 1959. Today there are many manufacturers of the rifle including Smith & Wesson, Sturm Ruger & Co., and many others.

Is it legal to assemble an AR-15?

Yes, it is perfectly legal to assemble your own AR-15 as long as you follow all state and federal laws regarding firearms ownership. However, this may vary from state-to-state so be sure to consult with local law enforcement before beginning any assembly.

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

To properly assemble your own Ar 5 rifle you will need several specialized tools such as a punch set (including a roll pin punch set), vice blocks (or equivalent), torque wrenches for barrel nuts and scope mounts , upper receiver fixture blocks (to hold everything steady while tightening parts) ,and other misc handtools like pliers etc.. Additionally You can find special wrenches designed specifically for use with the various parts on an ar5 which make installation much easier

Can I customize my assembled Ar 5 rifle ?

Once your ar5 build kit arrives there are many different ways you can customize the look or functionality of your new firearm! This includes things like swapping out specific components such as trigger groups or barrels based on intended usage . Also You may also want consider customizing things like color schemes using cerakote finishes or personal touches with engravings , custom grips etc

How long does it take to complete assembling my own Ar 5 Rifle ?

The amount time required achieving completion when building out one's own ar15 largely depends on individual's skill level, as well as the amount of time that can be dedicated to the project. Generally speaking a new builder should expect assembly completion within 8-10 hours spread over at least two days. These includes tasks like drilling and tapping lower receivers, which may take several attempts before achieving good results. A more experienced builder could complete this task in under four hours with proper tools and working space.

What are some common mistakes people make while assembling an AR-15?

One of the biggest mistakes that beginners make when building out their ar15 rifle is not having patience or taking shortcuts during critical steps in order to save time/money . One should always read through instructions carefully prior starting anything , also it worth pointing out that one cannot use any old parts lying around for Assembly as each part has unique fitment specifications! Also using wrong tools can lead to permanent damage on both firearm and tool itself requiring costly replacement . It is always recommended to seek professional help when necessary or consult resources like Youtube videos etc..

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