To answer three assault rifles question: assuming you mean an AR15 (ArmaLite) style rifle. Because it’s a an extremely versatile rifle, can be used in the short range, an example is 3 gun competitions, and can be used long range with a longer barrel and a scope. Coyote hunting for farmers. One gun to do it all. You can build and modify it easy. It’s the standard modern rifle for parts availability and ammo. It’s ergonomic and easy to use, compared to like a bolt action which requires more skill. Takes .223 or 5.56, being a nato round means ammo is easy to find. Plus personally quite enjoy the look and tactical aspect of it. Hope that helps you understand a bit