Firearm Manufactured by Unlicensed Subject
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Also known as a Self-Made Firearm or a Self-Assembled Firearm
A US is an Unlicensed Subject, meaning a person who does not have a license to manufacture firearms, what is often called a FFL07.
A person could start with raw material, such as an aluminum billet or steel block.
However, most people start with is commonly known as a "80% receiver", but is legally called a "precursor part".
If an US intends to self-manufacture a firearm, the person will file an online application for a Unique Serial Number Application (USNA) through the CFARS online system.