A crystal or crystalline solid is a solid material whose constituents, such as atoms, molecules or ions, are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.nhedral crystals do not, usually because the crystal is one grain in a polycrystalline solid. The flat faces (also called facets) of a euhedral crystal are oriented in a specific way relative to the underlying atomic arrangement of the crystal: They are planes of relatively low Miller index.
Answer Wiki. Actually, in modern warfare, tracers are not used as they were during previous wars. They were originally used to allow gunners to track where their small caliber bullets were actually going. However since their ballistics were quite different than the standard rounds, they only gave a rough estimate for targeting.
The equipment to alter a semiautomatic weapon and have it fire like an automatic weapon is known as a bump stock. How does it work? A bump stock is a piece of plastic or metal molded to the lower end of a rifle. The device allows a shooter to fire dozens of rounds in seconds by harnessing the gunâs natural recoil. A rifle with this type of mechanism is optimal with a high-capacity magazine that can hold between 60 and 100 rounds and a hand grip that allows a shooter to push the rifle away from the body to bounce, or bump, the weapon into the trigger finger.