Grab a spare or replacement mag to efficiently feed your AR the ammo it needs. Counter recoil and unwanted muzzle rise with a high-quality AR muzzle device. Finish out your stripped lower receiver with kits designed for the discerning shooter.

Improve the looks and ergonomics of your AR with one of our well-made trigger guards. A quality grip can help you stay comfortable and locked in during your trips to the range. Better comfort and accuracy. We are experiencing a high volume of orders.

Please allow up to 7 days for your order to process. Read More. Find AR parts for performance and personalization at prices that stay in your budget at Cheaper Than Dirt. Browse thousands of the top-rated AR magazines, upper receiverslower receiversAR lower partssights and other quality accessories.

We also carry a great selection of AR ammored dot sights and sturdy slings to help fully customize your rifle. Whether you are looking to build or buy the perfect AR, we have everything you need and more! Less More. What are you looking for? Shop All Magazines.

Top Pick. ASC AR Knowledge is Firepower. Shooters all over the country turn to the AR platform for all kinds of uses like home defense, competitive shooting, hunting, and even use on the ranch as a truck gun. Learn about the AR Upper Parts. AR Barrels Start your build or upgrade off on the right foot with a high-quality barrel.

Shop All Barrels.We're sorry, midwayusa. Learn how you can enable Javascript. Before you buy your first part, decide what kind of rifle you want. Will you be varmint hunting, plinking or competition shooting?

AR-15 Parts

Once you make this decision, you know what type of upper receiver and barrel you will use. The upper receiver and barrel you choose will determine the remaining parts needed. Here are several types of stripped upper receivers, each with different features for different applications.

Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A1 sight assembly that allows only for windage adjustment.

This upper is ideal to build a "Retro" civilian version of the Vietnam era M Rifle.

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Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A2 sight assembly that allows for windage and elevation adjustments.

This is a popular upper to use for building a rifle for use in shooting matches. Has a flattop with picatinny rail, shell deflector and requires the installation of the forward assist assembly and ejection port cover assembly. This is the current military upper and is used to build a civilian copy of the M4 carbine with 16" barrel or M A4 rifle with 20" barrel. Has many configurations for the upper receiver with various heights of picatinny rails for mounting scopes.

These generally do not accommodate the forward assists or Ejection Port Cover assemblies or also known as the "Slick-Sided" uppers.

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For your project, we decided to build a Varmint Rifle in Ruger. Since we want to scope your rifle, we do not want an upper receiver with a carry handle, nor do we need open sights. That rules out the AR A1 and A2.

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Therefore, either the AR A3 or the Flattop will do. We chose the A3 because of its versatility. In addition, since we are building a Varmint Rifle designed for accuracy, we want to install a bull barrel with a free-float hand guard. Now that we have selected the type of upper receiver A3we know we need the forward assist assembly and Ejection Port Cover assembly.

These parts would not be required had we selected a Flattop. In addition, since we are using a bull barrel with a free-float hand guard and without sights, we need a gas block but do not need a flash hider. Had we decided to use open sights, your front sight would have had the gas block built in. The free-float hand guard does not require the use of a delta pack or hand guard cap, as these are integral to the Free Float Tube hand guard.

Make sure you have a good AR schematic to use as a guide in assembling your upper assembly. The schematic is helpful in finding the correct names of parts and determining what they look like. Start the Forward Assist Pin into the bottom of the Upper Receiver so it stands on its own it is always a good idea to drive punches or hammer on the side that is least visible.

Insert the Forward Assist Assembly, make sure the pawl is oriented toward the middle of the receiver. While compressing the Forward Assist Assembly, drive the pin through until it is flush with the receiver. Once the pin is firmly started, you should not have to hold the forward assist in place and you can use a large brass punch to drive the pin in until it is barely sticking up.

If you find this too awkward, you can use a small punch as a slave pin to keep the Forward Assist Assembly compressed so you can use both hands. You may have to take a small punch and drive the pin a bit further until it is flush or even slightly recessed just look at both sides to try and center the pin in the Upper Receiver.

Test the Forward Assist to make sure it moves freely in and out when compressed. Forward Assist Assembly is now installed. Be sure to make a direct, downward strike on the snap ring. This is also a good time to check and make sure your safety glasses are still on.Well, it all begins with a little planning and that means determining what parts you need and the required tools and instructions for putting it all together.

The first thing you should do is come up with a very rough idea of what you want from your weapon and settle on a budget. You should think about the intended purpose for the weapon and where you will be using it the most.

This will help you out later on when you buy your parts.

How to Install an AR-15 Hammer & Trigger Assembly

Every fully-functional AR is made of the same basic components. For now, I want to point out what the important components are and what exactly they do. The AR is made of two main components, the complete upper receiver and the complete lower receiver. The stripped upper receiver is the base of the complete upper receiver.

It also features an ejection port where spent rounds are expended and a forward assist button that aids in feeding rounds in certain scenarios. Internally, it houses the bolt carrier group, and has an external charging handle that you pull back to chamber a new round. Forged and billet receivers are most prevalent, each offering their own advantages and disadvantages.

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Forged receivers are the most common choice and they offer a combination of strength and cost effectiveness that is hard to beat. Billet receivers are also popular but more expensive than forged receivers and not quite as sturdy. Billet receivers are aesthetically pleasing and there are a ton of interesting variations that you may find appealing. Regardless of any perceived strength issues, billet receivers perform as well as forged receivers and are an excellent choice for a high-end build.

The upper receiver has only a few parts to contend with and installation is simple. The main components are the ejection port cover, forward assist button, charging handle and associated parts. But I recommend always choosing parts from a reputable manufacturer for added security.

Charging handles are a common upgrade and many people find larger or ambidextrous latches make charging their weapon a lot easier. If you are left handed or have trouble charging the weapon this is something you want to consider. The bolt carrier group is the heart of the AR Rapidly expanding gas, siphoned through the gas system, enters the gas key on the bolt carrier.

The bolt carrier group is pushed rearward and extracts the spent cartridge and ejects it through through the ejection port. Simultaneously, the excess gas is vented to the atmosphere.This is a complete list of everything you need to build an AR rifle. Of course, our recommendations are not exhaustive.

There are so many different ways to configure an AR from mass-produced cheap polymer lowers to mom and pop shops machining custom competition, match-grade parts. In this article we are just going to be looking at the parts you will be needing, and where to find them. The most convenient way to get all of these parts is by purchasing a full AR lower parts kit.

ar 15 parts list spreadsheet

The kits include all 31 items, including a pistol grip and trigger. However, some items you will probably want to discard from the pre-packaged kit and purchase as separate upgrades. Located behind the trigger guard and at the back of the rifle is the pistol grip. You grasp this with one hand to aid in shooting the rifle. A basic pistol grip is usually included in the lower parts kit, but many find aftermarket grips fit their hand better.

Hammer and hammer spring Trigger and trigger spring Disconnector and disconnector spring Two fire control pins. The selector is the safety switch and is included in a basic lower parts kit. Left-handed and ambidextrous selectors are available. The bolt catch stops the bolt from traveling forward when the magazine is empty. The standard lower parts kit includes a basic bolt catch. The magazine release drops the magazine out of the firearm. The standard lower parts kit includes a magazine release.

The bolt carrier group holds and moves the bolt.

Check List: Tools & Rifle Parts to Build Your Own AR-15 Rifle

It also resets the hammer. The bolt carrier group includes the bolt carrier, complete bolt, firing pin, carrier pin and gas key. The gas key feeds gas from the gas tube into the carrier and bolt. The bolt carrier group holds the majority of the gas pressure when the AR is fired. It is what makes the AR function and an essential, if overlooked piece.

The buffer slows down the bolt on the AR, absorbs recoil and reduces wear on the rifle. Buffers come in two different sizes, either rifle or carbine and in four different weights from lightest—the standard—to the heaviest, called an H3 buffer. For an AR chambered in. The type of stock you chose for your AR will determine the size of buffer you buy.

Parts list for your 6.5 Creedmoor – Shawn’s Assem-Build

For a collapsible or adjustable stock, buy a carbine buffer. If you are building your AR in 9mm, you will need to buy a 9mm-specific buffer assembly. The buffer tube holds the buffer spring and buffer. Choose the right size for your stock. Buffer spring.Posted by Shawn Herrin Feb 9, Guns 0.

This is not a review. None of these products have been tested yet. This is just a listing of the parts I picked and some reasons why. Now that they are getting pretty popular I decided to build one and jump on the train. I got sidetracked setting up a spare mixer and huge speaker to play DMX on my tablet.

One of the most annoying things about building anything based on the AR is the inconsistency. I chose an Aero Precision complete upper and Aero Precision stripped lower because they have a great reputation but also because the prices were pretty great on Brownells.

Finished it with an Aero Gas Block and Spikes rifle length gas tube. Makes it easy. Faxon Firearms also provided the Bolt Carrier Group. I have several and knew it was a solid choice. To move it I chose the Radian Weapons Raptor. Price was great too. Weight was a concern.

ar 15 parts list spreadsheet

I have some rifles approaching 15lbs. Final weight on this with optic is I opted for a Luth-AR carbine buffer tube, spring and a. This is important! You need the short. Finished off the back end with the Luth-AR Skullation stock. I picked up the trigger from Brownells a while back. I will say, the trigger might need some tinkering as the hammer seems impeded when the trigger is pulled. I used the CMMG. Color coded envelopes help keep organized. Seems solid. I swapped out the backstrap to the large with a swell.

Discounts Deals on AR Parts & Accessories

It contains an oil container in the removable bottom. Finished it off with a Brownells cantilever 30mm mount and a Lucid Optics L5. Both are inexpensive and again, I have both so I stuck with something I knew.

Cost was a factor in these choices as well.We are a national retailer of individual components and not all products depicted on this website are legal in every state.

Shipping of various products found on this website are prohibited to some states such as California, Connecticut, New Jersey, New York, Pennsylvania, and Washington. The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them.

It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative. Best Sellers. At lower. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws.

When performing your own research, please be sure that you are getting your information from a reliable source.After buying my first complete ARI immediately wanted to try my hand at building one myself. The process ended up being a lot easier and more rewarding than I expected. If you're looking to build your first AR or just need a refresher, we've got you covered. Below you can find a full AR parts listincluding parts that we recommend and use ourselves.

Let's start off with all the parts that you need to complete your lower receiver. For each part, we've also linked comprehensive guides explaining what to look for and our full list of recommendations for each part. This is because it is the portion of the AR that is serialized technically the "firearm".

All other parts can usually be shipped directly to your door. I generally just go with whatever is cheapest, so long as its a forged T6 aluminum receiver.

I've never had any issue with a cheap receiver and wouldn't bother spending up unless you're trying to build an ultra-lightweight rifle or want to go with something particularly unique. Aero Precision is another great option that's relatively affordable, though a bit more expensive than the previously listed options.

To learn more about choosing a lower receiver and see all of our favorite picks, check out our guide on the best stripped lower receivers.

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Lower parts kits include all the springs, pins, and detents you need to build your lower receiver. Geissele Lower Parts Kit.

ar 15 parts list spreadsheet

For example, this Brownells MOE Kit includes absolutely everything you need to complete your lower receiver, including a pistol grip, stock, and buffer assembly. Personally, I prefer BCM's parts kit over the one above because it comes with a better pistol grip and slightly better trigger in my opinion.

With that said, I eventually end up swapping out the trigger anyway. Unlike the Brownells kit, however, BCM's does not come with a buffer assembly or stock. If you want to choose specific parts for things like the pistol grip, stock, buffer assembly, and trigger then you may want to go with a more basic lower parts kit.

Some of the above lower parts kits include good Mil-Spec triggers, but they're still Mil-Spec triggers. Chances are you'll want to upgrade. The double stage trigger has a 2. I wouldn't overthink the pistol grip too much.