AR 15 Upper Receivers

If you need an AR 15 Upper Receiver for your next build, this is the place for you. We have some of the highest rated options available listed below. Below that is some information about how the upper works and why it’s so important.

What you can find in an AR 15 upper receiver are the rear sight assembly, carry handle, barrel attachment point, front pivot pin lug, production codes, ejection port cover, rear takedown lug, case deflector and forward assist.

When you understand how it is assembled, preventive maintenance of its parts is generally easy and more accurate, keeping your AR 15 in tip top shape all the time. Swapping parts that keep it running the right way or you can even customize it to your preferences.

Although it is advisable to buy an AR 15 upper receiver from a reputable company because of assurances in the quality of the unit not to mention the convenience of warranty policies, but it is also important to understand the whole process of the upper receiver for maintenance and even troubleshooting purposes, that is why some enthusiasts build their own upper receiver.

Another aspect you can gain when you build your own upper receiver is the advantage of choosing your own exact components and specifications, giving you the knowledge of the general layout of the upper receiver where most of the action occurs.

There are many variants of an upper receiver, and they are the M16, which is generally used by the military, the A1 model that features the forward assist for the rifle, the A2 which added a much more adjustable rear sight and case deflector convenient for left handed users while retaining the forward assist of the A1.

Another variant is the Flattop, which features a removable handle, this variant allows the attachment of weaver style rings, and this model has the option for high rise design which is better for high scope positioning. Another is the 9mm Colt and the last one is the M4 which features several feed ramps.

After you have chosen the variant or style of upper receiver you prefer, you have to have the right specialized tools to properly assemble and maintain your AR 15 upper receiver.

At the least you have to have the upper receiver block, armorer’s wrench, lubricant, starter roll pin punch, bench block, break free CLP, ½ inch torque wrench, vise and hammer. These ensure that you have the equipment to safely assemble your upper receiver to avoid damages that can hamper or jam the operation of your rifle.

You can check the different websites in the internet for a step by step guide on how to assemble your AR 15 upper receiver, but there is still no substitute for a trained gunsmith or experienced personnel teaching you the basics and even the complicated pivotal parts of the process especially the critical parts that are major components in the overall operations of your AR 15.

When you have successfully assembled your AR 15 upper receiver, you need to check that it is safe to fire and if it functions correctly. The priority is on the clearance of the Gas Tube and Carrier key, it is important that the two do not touch, if they make contact, it could cause the upper to shoot less accurately.

Hey guys, I'm Specialist Paul Bauer. I'm an active duty member of the U.S. Airborne Infantry and have served almost a year in Afghanistan. While I was there, I developed a strong passion for AR-15's and it stayed with me to this day.
I've built this site to help share my passion of AR-15 building with you! If you want to reach out to me personally, the best way is to e-mail me at