The .223 is common. The accessories make that gun look a lot more impressive. And you can't tell a gun's lethality just by looking at it -- the difference betwe

The .223 is common. The accessories make that gun look a lot more impressive. And you can't tell a gun's lethality just by looking at it -- the difference between semi-auto and full auto is just a cut-firing-pin apart on some guns, so there's no way to tell from outside the weapon.