The Ultimate AR 15 Build Guide

Looking for step by step instructions for your AR-15 build? You’ve come to the right place. in this AR 15 build guide we’re going to feature step by step AR 15 build instructions, videos, other helpful articles that you may find useful, and so much more. It’s worth pointing out that this will be an ongoing piece, whenever we post new gun build articles, like this LE Colt M4 AR-15 build.

We’re going to highlight some cool ad ons for your weapon, different methods of thinking when it comes to putting together the best AR-15 platform money can buy.

What does AR-15 mean? 

Contrary to popular belief, “AR-15” does not stand for “Automatic Rifle 15”. It stands for ArmaLite Rifle, the company who built the platform prior to it’s sale to Colt Firearms.

Quick hitting AR facts

This platform is a modular weapon, meaning it can be customized. You can change the upper components, sights (obviously), and the lower platform along with grips. Adding accessories is a fun (and expensive) hobby for many AR-15 enthusiasts.

  • This weapon is one of the most popular rifles in the United States
  • AR-15’s are no more powerful than other weapons of the same caliber and in many cases are less powerful than quite a few big game calibers (i.e, the .300 Win Mag)
  • Used largely for target shooting and competitions, though varmint hunting is becoming increasingly popular as the crowd expands their interests
  • Developed in the 1950s by Armalite Rifle, the Armalite company was later sold to Colt
  • While they look like military / law enforcement style rifles, they’re semi-automatic meaning they only release one round per trigger pull
  • It’s legal to own this type of rifle in most states, provided you meet state requirements

Difference between AR15 and M4?

First off, to acquire an actual M4, you’d have to sign up for the US Military or some government outfit. The M4 platform is built specifically for the US Government. The AR15 generally has a 16 inch barrel, the M4 a 14 inch barrel for tactical purposes.

Second, the M4 has a 3 round burst / fully auto option where as the AR 15 is at best a semi auto rifle. The American public and media likes to twist this around, suggesting that the AR-15 is a true assault rifle, when, in fact it is not.

Disclaimer: know your federal, state, and local laws before doing your own AR-15 build. This article is not going to show you how to build an illegal gun platform. We’re gun enthusiasts who support the 2nd amendment just as much as you do, but we stay within the confines of the law and you should as well.

PSA 5.56 & .223 Wylde Builds (photo by

How to build an AR 15

First things first, you’re going to need to start with a platform. There are a number of AR-15 manufacturers out there.

What does LE Mean AR-15?

LE stands for Law Enforcement. Typically, LE style AR15’s have different sized barrels.

What does “Mil-spec” AR15 mean?

It refers to dimensional, heat treatment, finish, and testing specs for the rifle. It does not mean it’s built for the military. Rifles built for the military have a full auto or 3 round burst capability.

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