8 Best AR-15 Lower Parts Kits in 2023


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January 1, 2023

Buying a complete lower parts kit for your AR-15 certainly has its benefits. The most notable aspect of this purchase is that it’ll be much cheaper than buying each part separately. If you have intentions of building your own rifle or replacing your current parts it is important that you are working with the right kit for your needs.

With that being said, there are many different lower parts kit packages available on the market. The wide range of products will likely leave you not knowing where to start your search. In order to make your search easier, this guide has been created to give some insight on the subject and introduce you to the eight best AR-15 lower parts kits.

Best AR-15 Lower Parts Kits

Brownells AR-15 Lower Parts Kit 5.56

brownells ar-15 lower parts kit 5.56

This kit is meant for anyone who is looking to upgrade some of the basic parts of an AR-15. This is going to require you to do a little more work on your own, but it has everything that you need in terms of parts for your lower receiver.

Purchasing this lower parts kit means that you hold the ability to choose your fire control group as well as the grip and stock assembly.

It is important to note, however, that this is probably not going to be your best bet if this is your first time working on a rifle. These are more complex parts that require more attention than most other kits. Overall, this is a great lower parts kit that is geared towards those who are experienced in building rifles.

Key Features

  • Optimized for customization
  • Great for value buy
  • Covers the basic needs without getting fancy

Palmetto State Armory MagPaul MOE Lower Build Kit

palmetto state armory magpaul moe lower build kit

The Palmetto State Armory MagPaul is an excellent buy if you are looking for a semi-upgraded kit that has everything you need. This will take your lower receiver from stripped to complete as many shooters have had a positive experience with this kit.

The best thing about it is the fact that it is priced so competitively. It will be very hard to find a lower parts kit of this caliber at a cheaper price.

Key Features

  • All in one lower parts kit
  • Competitive prices
  • MagPaul MOE furniture

CMMG AR-15 Lower Parts Kit

cmmg ar-15 lower parts kit

This standard lower parts kit makes it much easier to build your rifle, making this a great buy if this is your first time building a rifle. There is a multi-spec trigger and A2 style grip, which are both aspects that shooters seem to enjoy most about this kit.

Overall, this is a great buy for anyone as it is great for beginners but will still pose benefits for experienced builders.

Key Features

  • Classic lower build kit
  • A2 Style grip
  • Multi-spec trigger

Bravo Company Lower Parts Kit

bravo company lower parts kit

With a nickel Teflon finished grip and about 5.5 pounds of pull weight, this is another one of the top lower parts kits on the market today. Bravo has created a foundation for their company with the intention of providing civilians with excellent self defense tools. They want to make sure that your rifle will be effective no matter what situation so they have a severe focus on functionality.

Key Features

  • High quality parts
  • Durable
  • Nickel-coated trigger

Geissele Automatics Lower Parts Kit

geissele automatics lower parts kit

This company has grown to be a very popular manufacturer of AR-15 parts, making this an excellent choice for a lower parts kit. Though it is important to note that this is not a full kit. You will not find a grip and buffer in this kit, which are parts that are typically included in the kit.

Despite the fact that it isn’t a full kit, there is still a major focus on durability when it comes to the Geissele Automatics Lower Parts Kit. This high quality kit can make it through some of the toughest conditions so that you are able to work with it during any circumstance.

Key Features

  • Great value
  • Very durable

Brownells AR-15 Lower Parts Kit With Trigger Assemblies

brownells ar-15 lower parts kit with trigger assemblies

Brownells is an excellent company that has build up a solid reputation in the industry. This lower parts kit with trigger assemblies is a traditional lower parts kit that offers a little extra. Overall, this is going to be a great kit for you if you are a beginner. Those who have experience in building rifles may find this to be a little too simple.

Key Features

  • Easy installation
  • Trigger assemblies included
  • Durable parts

Seekins Precision Enhanced Builders Kit

seekins precision enhanced builders kit

If you are looking for a kit and are not in need of a trigger then this is going to be a great option for you. The Seeking Precision Enhanced Builders Kit comes with an upgraded bolt catch, ambidextrous safety, takedown pins, and mag release. Just to name some of the things you will receive in the kit.

The bottom line with this kit is that you will receive some great parts that are going to stay strong through different conditions.

Key Features

  • Upgraded bolt catch
  • Ambidextrous safety
  • Durable material

Elftmann Tactical Lower Parts Kit

elftmann tactical lower parts kit

This complete AR-15 lower parts kit is designed to make it nice and easy to build your rifle. With an enhanced drop in trigger, you will have everything that you need to create a durable and effective rifle.

It may run you a little more money than most of the other kits, but that is absolutely backed up with great parts for your firearm.

Key Features

  • Enhanced drop in trigger
  • Great quality

What is a Lower Parts Kit?

A lower parts kit is a package of over 100 individual parts that you can use to build or repair a rifle. It is called a lower parts kit becuase of the fact that most of the parts in the kit are meant for the lower half of the rifle. Some of the most important parts that are included in a lower parts kit are the trigger, safety, grip, hammer, magazine catch and buffer assembly.

Trying to bring in each of these parts individually is a process that is both tedious and expensive. That is exactly why the lower parts kit was created, to save money and time.

The best part about it is the fact that if you get a well rated lower parts kit from a good company then you are going to see a consistent level of quality among the pieces. This may be something that you won’t experience if you were to go and purchase everything separately.

Why Buy a Lower Parts Kit?

There are basically two reasons why you would want to buy a lower parts kit for your AR-15. The first would be if you are building your own rifle. When building your own rifle, it makes it much easier to buy a lower parts kit. The reason being is that you will have the convenience of making one purchase to get parts that are all going to work well together. That certainly beats having to shop for each part separately.

The other reason to purchase a lower parts kit is if you are looking to make repairs on a rifle that you already have. If there are some parts that you would like to switch out then it may be worthwhile to just purchase the whole kit. It can turn into a fun project and will be a way to make your rifle feel new again.

How to Choose the Right Lower Parts Kit

Any lower parts kit is going to offer the same individual parts for the most part. You may run into a few that offer some additional parts, but the core parts are typically present across the board. With that in mind, you may think that you can get away with purchasing any lower parts kit that you see. However, that is not always the case.

Not every lower parts kit is made the same. There are going to be some that are better than others. The last thing that you want is to put together a rifle that is going to have some parts break eventually, this can lead to some major complications within your firearm. In order to get you started in the right direction, take a look at some of the important considerations when buying a lower parts kit.


If you are purchasing the lower parts kit with the intention of repairing your existing rifle, then the most important thing is to make sure that the parts can work with your current rifle. There may be slight differences in sizes depending on how you customized your rifle when first purchasing it.


As mentioned above, the last thing you want is parts that are prone to breaking. You can avoid making a bad purchase simply by looking at reviews on the product. If there are some issues with durability than people who have bought in the past will certainly be vocal about that.


This isn’t too big of a deal, but parts can sometimes come in different colors. Whether you are building the rifle from scratch or repairing your existing one, you want to make sure that you like the color because this is a purchase that is going to stick with you for a while.

Wrap Up

If you are looking to build or repair your AR-15 then investing in a lower parts kit is certainly going to make the process much more bearable. Building a rifle can be fun, but searching for and buying the parts can become a very tedious task.

With that being said, you want to make sure that you are buying a lower parts kit that is going to serve you the best. This guide has been presented to you with the intention of providing the education and sample kits that you need in order to make an informed decision on your purchase.

Every product is hand selected by our editors. We may receive commissions on purchases from a link.

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