2020's Best AR-15 Lower Parts Kit Reviews

OUR TOP CHOICE: CMMG Lower Receiver Parts Kit8000601

  • Buttstock kit compatibility
  • Fairly priced
  • Quality performance
  • Premium materials

The CMMG Lower Parts Kit reaches military specification standards. Whether you are looking to customize your weapon or optimize it for precision, this kit is the right choice for your AR-15. It can be used with buttstock kits which allows you to adjust your rifle further if needed. 

If you are trying to exchange components from your current AR lower receiver or are constructing a stripped lower receiver, lower parts kits can provide a solution. There are multiple springs and small parts to keep track of when rebuilding or swapping parts in a gun. A lower parts kit helps keep these parts organized when you are trying to assemble or reassemble your weapon. 

Here are some parts that can make up a lower parts kit: Bolt catch, bolt catch spring and roller pin, disconnect spring, magazine catch and spring, and a selector. This is not a full list, but rather a few parts for you to look for when reviewing different kits.  

2020's Best AR-15 Lower Parts Kit Reviews

Editor’s Choice: CMMG Lower Receiver Parts Kit

The CMMG Lower Parts Kit reaches military specification standards. Whether you are looking to customize your weapon or optimize it for precision, this kit is the right choice for your AR-15. It can be used with buttstock kits which allows you to adjust your rifle further if needed. 

This kit offers quality parts at a moderate price. If you have high expectations, don’t settle for a subpar product. If you are looking for a quality low parts kit at a reasonable price from a company that you can trust, then click here

Top 7 Best AR-15 Lower Parts Kit Reviews

With a black finish, this lower parts kit can blend with any other customization or build you are working on. Its universal caliber feature makes it a versatile option for both beginners and experts. 

Many customers have said that this product is made of great quality and is available at a reasonable price. CMMG color codes the bags with all the parts that are included so you can set up your installation with ease. 

This kit is a great option for anyone looking to upgrade or customize their AR-15. CMMG has also made a video to help with the installation of the parts.

With all the lower parts kits on the market, it can be tough to find which one suits your needs. This kit is a great option if you are looking to change from a composite lower to an aluminum lower receiver on your AR-15. 

If you want a lower parts kit that provides premium quality components, ease-of-use, and reliability, then look no further than this CMMG Lower Parts Kit. 

Who Should Get This? 

If you are looking to upgrade some parts or build a customized AR, the CMMG kit can provide you with quality, reliability, and accuracy. It doesn’t matter if you are a beginner or an expert, this kit is guaranteed to get you set up and running. 

  • Universal caliber
  • Crisp trigger
  • No need for additional drop-in trigger
  • Color-labeled bags for easy installation
  • Grip angle

Although this item is a little more expensive than the first kit on the list, it still remains a top choice for both its quality and reliability. This kit comes with 17 components that are coated to preserve the quality and fit of each part. 

This kit does not come with a fire control group which is useful for anyone who wishes to install their own trigger into a custom rifle build. Aero Precision is known for its great value, fit, and quality. This kit embodies all three features. 

At a price that is hard to beat, this AR-15 lower parts kit is just what you need to get the job done. It is guaranteed to provide the proper feature connection due to its mil-spec measurements. 

All the parts in this kit fit well and look great on any AR-15 build. It does not come with trigger pins so you have to purchase those separately. 

Who Should Get This? 

This kit is the ideal option for any gun owner who is customizing a build on a budget or for any gun owner working on multiple builds. You do not have to be an expert gun-builder to install this kit, which makes it great for beginners in customizing builds. 

  • Extremely reliable
  • Meets military-grade specifications
  • Great value, quality, and fit
  • High-end quality but inexpensive
  • No grip available with this option

If you are looking for that specific trigger feel that you aren’t getting from a nickel boron trigger, this BCG kit comes with a nickel Teflon trigger that can make all the difference. 

Its user-friendly installation comes with picture-guided directions on the back of the package. If you are a complete beginner, you can install this lower parts kit with ease. 

You may pay a little more for the brand and the upgraded trigger with this kit, however, the quality mil-spec features make it well worth the investment. Many customers have reported positive feedback from the lightweight trigger feel. 

All of the parts are well-oiled before they are shipped to prevent rust. With this kit, you can rest assured of its comfort, reliability, and durability

The finish and fit of this kit are unmatched. Bravo Company Gunfighter pays attention to detail all the way down to the tension of the springs. 

Who Should Get This? 

This would be a great choice for beginners because of its easy installation. If you are familiar with customizing your own AR-15 builds and are looking for top-notch components at a reasonable price, then this kit is for you. 

  • Polished nickel Teflon trigger
  • Smooth trigger movement
  • User-friendly installation
  • Military specification standards
  • Class-leading lightweight trigger
  • Compatible only with Remington .223 caliber ammunition

Available in anodized black or flat dark earth, this lower parts kit gives you a little more variability when it comes to choosing a finish for the grip. This kit uses a regular bolt catch roll pin instead of a threaded bolt catch roll pin. 

Instead of a 45-degree safety selector, it comes with a 90-degree safety selector to ensure there are no misfires. All the parts are carefully designed to ensure a proper fit so you never need to hammer in parts or worry about a difficult installation process. 

The Magpul MOE grip provides optimum comfort with accuracy and precision. The texture of the grip allows you to really get a good handle on your AR-15 for increased control. 

It does not come with a fire control group which is important to note in case you are looking for a more extensive lower parts kit. Aero Precision does offer a mil-spec fire control group separately. 

Who Should Get This?

If you are looking to build your own M4E1 lower, this kit from Aero precision is a great choice. With a Magpul grip and other quality parts, you can’t go wrong with this kit for the price.

  • Magpul grip
  • Comfortable grip texture
  • Inexpensive
  • Best-in-class Aero Precision quality
  • No fire control group
  • No hammer/trigger pins

Tactical Superiority is a massive distributor of lower parts kits and is a leader on the market. All parts are made in the USA and meet mil-spec standards

Some of the items included in this kit are a black A2 pistol grip, a trigger guard and trigger guard roll pin, a hammer pin, a safety selector, a bolt catch roll pin, and much more. This is a comprehensive lower parts kit that can easily complete any kind of AR-15 build you are customizing. 

At a more affordable price than most on the list, this lower parts kit from Tactical Superiority is guaranteed to provide you with great quality and fit. The parts are organized in color-coded bags so you can get your lower receiver up and running in a timely fashion. 

Whether you are trying to build a lower receiver from the ground up or just want extra parts in case something on your build fails, you can’t go wrong with this affordably priced kit from Tactical Superiority. 

Who Should Get This? 

If you are looking to upgrade or rebuild your lower receiver, this kit provides every part you need at a great price. Beginner AR-15 builders love this kit for its easy installment process, fire control group, and price. 

  • Color-coded installment
  • Equipped with trigger group
  • Fairly priced compared to other models
  • Made in the USA
  • Only for 5.56x45mm NATO ammunition

Although this kit is the most expensive one on the list, it is priced that way for a reason. Black Rain Ordnance does not skip corners, meticulously ensuring that every part is crafted with the utmost precision

It is the only other kit on this list that comes with a grip that is available in either black or flat dark earth. The drop-in trigger provides hassle-free performance and increased precision. 

The ergonomic Magpul grip fits all types of hand sizes. This is not a complete lower receiver kit, but it can definitely help you finish a lower receiver build with ease. 

The majority of custоmers rave about the incredible crisp trigger that this kit offers. You may need to lubricate some of the pins, as the fit is very precise and may require some maneuvering to get everything situated into the lower receiver.  

With a drop-in trigger, a Magpul grip, and two finishes to choose from, this Black Rain Ordnance kit is guaranteed to take your lower receiver to the next level. 

Who Should Get This? 

If you are looking for a premium drop-in trigger kit with all the necessary parts to go along with it, this kit from Black Rain Ordnance is a great fit. 

  • Ergonomic and unparalleled comfort
  • Single-stage drop-in trigger
  • Crisp trigger, no creep
  • Anti-walk pins with perfect fit
  • Slightly troublesome trigger group assembly
  • Very expensive compared to other models

Upgrade your AR-15 build with this mil-spec CMMG lower parts kit. It is affordable, but it does not compromise on build quality. 

There is no trigger guard, grip, or fire control group in this kit. These can be purchased separately if you need to fully build out your lower receiver. 

The parts are clearly labeled and easy to install. There is a plastic mag release button that helps cut down on the cost of the kit. If you wish to replace it with a metal one or some other material, they are very cheap and easy to find. 

All the parts are guaranteed to fit and function just as described. The safeties are strong and secure when locked into place and the roll pins can be inserted with ease. 

If you are working on a new build or your first build, this CMMG lower parts kit can help get you on your way to completing your lower receiver. 

Who Should Get This? 

This kit is ideal for anyone building a gun or replacing parts on a gun. It can provide you with quality components at a price you can afford. 

  • High-quality components
  • Military-specification standards
  • One of the lowest priced kits on the list
  • Excellent finish on all the parts
  • Fits all mil-spec stripped lowers
  • No trigger guard or fire control group
  • Plastic mag release button

Best AR-15 Lower Parts Kit Overall

CMMG Lower Receiver Parts Kit

The CMMG lower parts kit combines versatility, compatibility, and top of the line components all for an affordable price. There are many things to keep in mind when choosing a lower parts kit. 

Consider whether you need a grip in your lower parts kit. If so, this can impact the grip you need for your lower receiver. Kits with drop-in triggers are usually more expensive, so determine the parts you need first before spending money on unnecessary parts in lower kits.

The CMMG Lower Receiver Parts Kit is in a class of its own. It is equipped with mil-spec standards, and it can be used with buttstock kits and a high-quality metal grip. This kit is the best of the best. Look no further than this kit if you want reliability, affordability, and durability. 

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