So, what’s the difference?Īs you can see from the table above, the main difference is the strength and corrosion resistance. However, there are different alloys used in the fabrication of aluminum receivers and they are 6061 (T651) and 7075 (T651). This is mainly because this material is lightweight, strong, and also affordable. Most lower receivers you’ll see are made from aluminum. Make sure you do not mistakenly get one instead of a stripped lower. Although it is legal to purchase and have it shipped directly to your door, you should always conduct some research before handling 80% lowers. 80% Lower ReceiverĪs the name suggests, 80% lower receivers are partially finished with missing drilled holes used for installing a trigger and safety selector. While it seems much more convenient to purchase a complete rifle instead of buying a lower and upper receiver separately, it can help you avoid paying firearms excise tax and to also provide you with the flexibility of getting a higher-quality part than those available in a complete rifle. A complete lower usually comes with a buffer system, stock or pistol brace, pistol grip, safety selector, trigger assembly, trigger guard, bolt release, and a magazine release. However, if you’re not too confident in assembling everything, you can always get one with all the lower parts installed. Building your own parts not only lets you customize it the way you want, but it can also even help you save some money compared to purchasing a complete lower receiver. Obviously, if you’re building your own lower receiver, you’ll definitely need this part. This part is essentially a piece of aluminum that you can add the other parts of the lower to create a complete lower receiver. Stripped Lower ReceiverĪ stripped lower receiver is the serialized portion of the AR-15 and it is also the only part that needs to be purchased through a licensed dealer (FFL). Below we shall briefly discuss each type of the lower receiver for your understanding. There are different types of lower receivers out there, namely stripped, complete, and 80%.
Stripped vs Complete vs 80% Lower Receiver Mil-spec hard coat anodizing for corrosion resistance Good upper receiver fit without any adjustmentģ. Automatic upper receiver tension adjustmentĪnderson Manufacturing AR-15 Stripped Lower ReceiverĢ. Good ergonomics with an integrated trigger guardģ. Includes all ambidextrous control hardwareĢ. Radian Weapons Ambidextrous AR-15 Lower Receiverġ. Basic features but useful and ergonomicģ. James Madison Tactical AR-15 80% Polymer Gen2 Lower ReceiverĢ. Spikes Tactical AR-15 Mil-Spec Lower Receiver Adjustable upper receiver tension for a better fit Lower ReceiversĪero Precision AR-15 Gen 2 Stripped Lower Receiverģ. While the lower receiver does not have many moving parts and is less prone to have reliability issues, simply getting the cheapest lower receiver you can find on the market is not the best idea.
The lower receiver makes up almost half of the AR-15 rifle, yet it is often brushed off as the best place to save money on your rifle build.
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