They are also known as the black truss markings. They provide a quick visual for the tape user and speed up the measuring process. Originally, 19.2 inches was used in metric layouts. Dividing 5 into 96 inches (8 feet) gives 19.2 inches, which yields five trusses per sheet. The black arrow in the photo to the right points directly at the black diamond located on 19.2. The red stud markings every 16 inches allow for a standard layout of six studs per 8-foot (96) section.
1 Minors under 18 must be accompanied by an adult at all times in the range and store. 2  You must be 21 years old to shoot a handgun & 18 years old to shoot a long gun without being accompanied by a parent or legal guardian.
A shooting range or firing range is a specialized facility designed for firearms practice. Each facility is typically overseen by one or more supervisory personnel, called variously a range master or Range Safety Officer (RSO) in the United States or a range conducting officer (RCO) in the UK.These supervisory personnel are responsible for ensuring that all weapon safety rules are followed at all times.ach facility is typically overseen by one or more supervisory personnel, called variously a range master or Range Safety Officer (RSO) in the United States or a range conducting officer (RCO) in the UK.