An unmarked upper receiver for an AR-platform rifle lacks the manufacturer’s identification typically found on this component. This absence of markings can be due to several factors, including receivers manufactured before marking requirements, homemade or “ghost” receivers, and receivers where markings have been intentionally removed. A completed firearm with such a component is sometimes referred to as an “80% lower” build, although this terminology is technically incorrect when referencing the upper receiver.
The presence or absence of a manufacturer’s mark on this key firearm component has significant legal and practical implications. Historically, unmarked receivers posed challenges for law enforcement in tracing firearms used in crimes. Furthermore, the increasing prevalence of unmarked receivers, especially in the context of self-assembled firearms, has prompted discussions regarding firearm regulations and responsible gun ownership. The ability to produce or acquire unmarked components raises concerns about accountability and the potential for misuse.
