What Is an 80 Percent Lower? A Clear, Simple Explanation

An 80 percent lower is an unfinished lower receiver that has not yet reached a completed manufacturing stage at the time it is sold. Because it is not fully completed, it is treated differently under federal regulations compared to a finished lower receiver.

Many people encounter the term “80% lower” online without a clear explanation of what it actually means. Simply put, the “80 percent” label refers to its manufacturing status, not its quality or strength.

For AR15 platforms, an AR15 80 lower serves as a base component that has not undergone final machining steps. At the time of purchase, it is not considered a completed firearm component under federal law. However, state and local laws may vary.

Understanding what an 80 lower is—and what it is not—is important before making a purchase. Buying from a transparent, USA-based seller ensures accurate descriptions, responsible business practices, and reliable customer support.