The words âat least 17 years of age and *â*â* under 45 years of ageâ are substituted for the words âwho shall be more than seventeen years of age and *â*â* not more than forty-five years of ageâ.
Steel is cheaper, and brass is more expensive, and not much of a structural material. Brass is a tensile metal, and has a great ability to bend. It is used to make bearings, valves and moving parts, because it does not break easily. Steel, on the contrary, is difficult to cast, and quite difficult to work with in small machines.
Brass Cased Ammo. Brass is a good metal because when it is fired, it expands very quickly and shrinks back down very quickly. When the round goes off, the neck expands and seals the chamber preventing the gases from spewing back. Compared to steel ammo, brass is a lot cleaner and has less malfunctions in your firearm.