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80 lowers," also known as "80% lowers" or "unfinished receivers," are firearm components that have become increasingly popular among gun enthusiasts and builders in recent years. The term "80 lowers" refers to the level of completion of these receivers, indicating that they are approximately 80% finished and require additional work to become functioning firearms.

In the United States, firearms can be legally built by individuals for personal use without the need for a license or serial number. This practice is often referred to as "building" or "assembling" firearms, and it has gained traction among gun enthusiasts who appreciate the customization and craftsmanship involved in creating their own firearms.

An 80% lower receiver serves as the foundation of a firearm, specifically for rifles such as the AR-15. It is the part of the firearm that houses the trigger assembly, magazine well, and serves as the attachment point for the upper receiver and other components. The term "lower" is derived from its positioning in relation to the upper receiver, which includes the barrel and the bolt carrier group.

The distinguishing characteristic of an 80 lower is that it is not yet a fully functional firearm. These receivers are only partially machined or finished by the manufacturer, leaving out certain critical features such as the fire control group pocket, trigger slot, and drill holes. This intentional incompleteness is what allows individuals to legally build their own firearms without the need for government oversight, licensing, or serial numbers.

To complete an 80 lower, the builder must possess the necessary tools, equipment, and skills to perform the remaining machining or finishing steps. This typically involves using a drill press, a milling machine, or a specialized jig system to accurately cut the necessary cavities, drill holes, and milling patterns in the receiver. The specific steps and techniques may vary depending on the manufacturer, model, and design of the 80 lower.

One of the key reasons why 80 lowers have gained popularity is the level of customization they offer. Builders have the freedom to choose from a wide range of options for their firearms, including different finishes, engraving patterns, and accessories. This allows individuals to create unique and personalized firearms that suit their preferences and needs.

Moreover, building an 80 lower can be an engaging and educational experience for enthusiasts. It provides an opportunity to learn about the inner workings of firearms, understand the assembly process, and develop hands-on skills in machining and finishing. Many enthusiasts enjoy the satisfaction of building a firearm from scratch and take pride in the craftsmanship and attention to detail involved.

It is important to note that while building firearms for personal use is legal in the United States, there are certain regulations and restrictions that must be followed. Builders must adhere to federal, state, and local laws regarding the possession, assembly, and transfer of firearms. It is essential to familiarize oneself with these laws and ensure compliance to avoid legal issues.

In summary, 80 lowers are firearm components that are partially completed and require additional work to become functioning firearms. They offer gun enthusiasts the opportunity to legally build their own firearms, customize their designs, and gain hands-on experience in the assembly process. While building firearms is a rewarding hobby, it is crucial to understand and follow all relevant laws and regulations to ensure a safe and lawful practice

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