STL is a tessellated file. It's good for things where you care about a complex surface that can't easily be defined with splines ( All About DXF File Format for 3D Printing - Xometry
Digital files for Glock components are used across a variety of legitimate and experimental fields: Reddit·r/AskEngineers glock cad files
When searching for Glock design data, you will encounter several standard file formats, each serving a specific purpose in the design and manufacturing lifecycle: STL is a tessellated file
Formats like .SLDPRT (SolidWorks) or .IPT (Autodesk Inventor) contain the full "history" of the design, allowing for the easiest modification of dimensions and features. Popular Applications for Glock CAD Data glock cad files