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Update:  On March 19, 2023 Polymer80 was granted a preliminary injunction and a restraining order against the ATF. Because GBD is an entity that buys directly from Polymer80, we are able to resume selling Polymer80's products to our customers.  

What is an 80 Lower Receiver?

An "80 lower" is a term commonly used to refer to an 80% lower receiver, which is a partially completed firearm receiver that requires additional machining and assembly to make it functional. The term specifically refers to the lower receiver component of a firearm.

The designation "80%" indicates that the lower receiver is only partially finished, typically lacking the necessary holes and cavities for trigger group components, selector switch, and other fire control parts.

Types of 80% Lowers

There are various types of 80% lowers available on the market, catering to different firearm platforms and models. Here are some of the common types of 80 percent lowers:

AR-15 80% Lower: The AR15 80 lower receiver is one of the most popular options. It is designed to be compatible with the AR-15 rifle platform, allowing users to build their own semi-automatic rifles chambered in .223/5.56mm.

AR-10 80% Lower: The AR10 80 lower receiver aka 308 80 lower is similar to the AR-15 variant but designed for the larger AR-10 platform, which is typically chambered in .308/7.62mm or similar calibers. Building an AR-10 requires specific parts and components to match the platform.

AR 9 80% Lower: The AR9 80 lower refers to an incomplete lower receiver specifically designed for building an AR-15 style pistol or rifle chambered in 9mm. It is designed to fit the AR-15 platform but with modifications to accommodate 9mm cartridges

Polymer 80 Lower: The Polymer80 lower is a type of 80% lower that is made from polymer material instead of metal. It is available in several different designs, including ones that fit the AR-15 and Glock platforms.

80 Lower Receiver: Serialization & State Restrictions

Some states require serialization of your lower before completion, and some states have banned 80% lower receivers, certain firearm parts, and other products we sell. Check your local and state laws, and please confirm whether we can ship to your state before ordering. See our Shipping Restrictions Here

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, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, 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.