An AR-15 80% lower receiver is a partially completed piece of material that is not considered to be a firearm by the Bureau of Alcohol, Tobacco, and Firearms (ATF). This means that it is legal to purchase and possess without the need for any special documentation or background checks. 80% lower receivers are made from various materials such as aluminum, polymer, or steel and are used to build custom AR-15 rifles. They are called "80%" because they are only 80% complete and require additional machining to be finished. This includes drilling the fire control group pocket, the trigger pin holes, and the hammer pin holes. Building a rifle from an 80% lower receiver can be a rewarding and cost-effective way to get a custom AR-15 that is tailored to your specific needs and preferences. It can also be a fun hobby for gun enthusiasts who enjoy the process of building and customizing their own firearms.
However, it is important to note that it is the responsibility of the builder to ensure that their completed rifle is compliant with all federal, state, and local laws. This includes following the ATF's guidelines for homemade firearms, which can be found on their website. In conclusion, AR-15 with 80% lower receivers are a popular choice for those who want to build their own custom rifles and have the skills and knowledge to do so safely and legally. They provide a cost-effective and satisfying way to get a unique, personalized firearm that meets your specific needs and preferences.
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