The assembled model will work for the vast majority of shooters. It comes with the forward assist and ejection port cover already installed. All you need to do is attach the barrel and handguard. The body itself features a more angular contours for improved aesthetics and durability. This gives your upper receiver a longer lifespan than the standard mil-spec design. Overall, this Aero Precision model is one of the best upper receivers on the market.
The Foxtrot Mike Products AR Ultra Light Monolithic Upper Receiver not only offers a very lightweight platform to build your rifle around, it also enhances the receiver to handguard fit for a more stable and durable forend.
This model is machined from T6 aluminum. The aluminum reduces the weight. The ejection port cover is already installed when you get this upper. However, the body features a slick side design without a forward assist. Some say the forward assist is unnecessary. But, if you want a forward assist, this may not be the upper for you. On the other hand, the design does feature an interlock system for the handguard that improves your forend stability and durability.
T he handguard interlock also makes it impossible for your barrel nut to come loose. So, it offers some peace of mind, too. Of course, the exterior is type III hardcoat anodized for mil-spec corrosion resistance. All in all, this Foxtrot Mike upper is probably best for those who prioritize weight reduction , since this model makes a couple sacrifices to keep the weight down.
JP Enterprises has been a staple in the competition AR market for years. But, it offers excellent performance. This model is type III hardcoat anodized. Additionally, the entire thing is finished with Black Teflon for better lubrication and scuff resistance.
This reduces wear on the internals and your bolt carrier group , and ensures that the outer finish remains intact despite rubbing on gear and magazines. T-markings are stamped into the picatinny rail. Even with the improved finish, this upper will still accept any standard AR parts. Since you have decided to build your AR why not assemble your AR upper receiver yourself as well? Again, you will acquire a great understanding of your gun and bolster your ego at the same time.
You can either buy an AR upper assembly kit or buy all the necessary pieces separately. However, if you have never built any gun before you might want to go with the assembly kit which will ensure that all the pieces fit together. Also make sure that you have all the necessary tools to do the job including a bench vice, armor wrench, a receiver block, and a barrel nut wrench.
There are four different types of AR upper s. Although they each have their particular features, the most obvious difference is whether there is a fixed carrying handle or not. After researching, reviewing, and comparing the above-mentioned AR uppers, we can establish the following criteria for the best upper:.
Hit the range, have fun, and shoot safe. James is a competitive shooter with multiple championship titles. James looks forward to bringing more instructional content to The Arms Guide to help the general public improve their skills. Affiliate disclosure: As an Amazon Associate, we may earn commissions from qualifying purchases from Amazon. Quick Navigation. Cons Charging handle does not fold Glock mags may swell which consistently causes failures to feed and lock open Not compatible with Korean magazines or aluminum cased ammunition.
Cons Heavy Bolt carrier group and charging handle are not included which makes it more expensive at the end. Cons No forward assist Looks plain Quite loud. Pros Compatible with current mil-spec AR lowers Free float handguard Machined and Lightweight: only 4 lbs Low maintenance No tools needed to take the handguard off Gas piston is adjustable. Cons If you shoot your AR fast, the handguard can get hot quickly.
Also lets you support the weapon with your non-dominant hand. Barrel The most important piece of the upper receiver. Besides your skill, It plays the main role in your shooting accuracy. Gas System Required for your rifle to cycle. Gas pressure forces the bolt carrier group backward which ejects the used round and puts a new one in the chamber every time you pull the trigger. The gas travels behind the bullet and enters the gas system through the gas port on the gas block.
Gas blocks are installed on the barrel, inside the handguard. Bolt Carrier Group Responsible for chambering and igniting rounds, assuring bullets are fired correctly, and ejecting used rounds from the chamber. It includes multiple components. Charging Handle The part that pulls your bolt carrier group to the rear when you want to load the first round into the chamber or need to clear a malfunction.
In case one round does not fire as expected, you can simply release the faulty shell and reload a new one with the help of the charging handle. While firing your AR, the charging handle remains stationary. Forward Assist Enhances your AR reliability.
It includes a dust cover and comes in black or flat dark earth. Not only is this upper beautiful, but it also combines perfectly with many of the best lowers on the market. This Seekins Precision upper is high-quality, reliable and durable. While it has a fairly no-frills design, it features a full-length top Mil-Spec Picatinny Rail, so there's plenty of room to add any accessories you fancy.
It's also made equal to or above Mil-Spec standards and will work well with most any part you might want to combine it with. At 11 oz. Spike's Tactical machines it from a solid forging of T6 aluminum before applying a type III hardcoat-anodized finish, resulting in a sturdy component that you can count on, even with heavy use.
It has M4 feed ramps, and an ejection port door cover and forward assist come pre-installed. It also includes a Picatinny rail for easy mounting of optics and other accessories.
The Gen II from Spike's Tactical is a heavy-duty upper receiver with several unique features that set it apart from other uppers on the market. It's made from a solid billet of T6 aluminum, employs a type III hardcoat anodized finish and weighs Spike's Tactical cuts the M4 ramps before the anodizing step, which increases reliability. This receiver has also has flared sidewalls on the exterior, which prevent accidental bolt release. It features a pre-installed forward assist port door and dust cover and works with most aftermarket rail systems as well as the Magpul BAD lever and most other aftermarket bolt release levers.
So, once you have your upper receiver of choice, what's the next step? First, check your local and state laws so you can be sure you're following them as you work on your custom build. Then, you can start selecting the parts you'll use to create the AR of your dreams. Here are some of the parts you should look for. Rails and handguards, which fit over the barrel, protect your hands from the heat created when firing. They also enable you to attach accessories such as optics, sights and grips.
The barrel you choose will play a crucial role in the accuracy of your AR You can choose among various lengths, shapes and designs for your barrel.
Keep in mind that anything shorter than 16 inches qualifies your build as a short-barreled rifle, which makes it subject to the National Firearms Act and the additional regulation that comes along with that.
Make sure you complete the necessary paperwork if you choose a shorter barrel so that you stay on the right side of the law. The type of barrel you choose will determine the length of your gas system, which will be either rifle, mid-length, carbine or pistol. A gas system consists of two parts — the gas block and the gas tube:. If you use an A2-style frontsight, this will double as your gas block. The gas block and tube push the Bolt Carrier Group into the buffer, enabling the ejection of spent casings and chambering of a new round.
The bolt carrier group, or BCG, holds the firing pin, bolt, extractor and ejector and controls the feeding, firing and ejection of your ammunition.
The charging handle enables you to load a round into the chamber or clear a malfunction. It doesn't move when the rifle fires. Instead, you use it when you need to move the BCG to load a round or clear a malfunction.
You use a forward assist to ensure that the bolt is fully closed in case the return spring doesn't do so. This is one of the parts that's most often viewed as optional. Another optional but useful component, the ejection port cover protects your upper receiver and BCG from debris such as dirt and dust. The port cover opens automatically when the BCG moves back but must be manually closed.
The muzzle brake, compensator and flash hider components attach to the end of the barrel and help to reduce muzzle rise, muzzle flash and recoil. When building a custom AR, you need to work with a company you can trust that sells the top-rated AR upper receivers. Wing Tactical provides only the highest-quality parts, including the best-rated AR upper receivers, and we pride ourselves on our excellent customer service.
We offer next-day shipping, hassle-free day returns and discounts for law enforcement, the military and first responders.
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