p80

P80 is an alphanumeric designation used in different fields to refer to distinct concepts, and there is no single, universal meaning. In everyday usage within the firearms community, P80 often refers to Polymer80, a brand known for producing 80 percent lower receivers and related frames for Glock- and 1911-style handguns. These products are sold as unfinished components that require milling or other work to become functional receivers. Because the status of serialized firearms varies by jurisdiction and by how the product is completed, laws and regulations concerning P80 items differ widely between countries and regions.

In materials science and manufacturing, P80 denotes a particle size metric known as the 80th percentile of a particle size distribution. Specifically, the P80 value is the size below which 80 percent of the sample’s material is finer. This metric is used to characterize and control milling, grinding, and particle processing processes in industries such as cement, minerals, pharmaceuticals, and food. The P80 parameter helps engineers specify target fineness and monitor process performance, often measured with techniques like laser diffraction or sieving.

Other uses of the term P80 or p80 may appear in product codes, model names, or internal designations across different companies and disciplines. Because the meaning depends on context, it is important to determine the field and specific product or specification when encountering the term.