What is a firing aperture?
His firing aperture was six inches wide at two hundred yards, leaving him a visual arc of more than 90 degrees. This arc would allow him to sweep the target area for anyone attempting to flee on foot in any direction.
Questions: what is a firing aperture? By saying it is "six inches wide at two hundred yards", what does it mean?The hide was a shallow trench, not much wider than his body, dug perpendicular into the back slope of a subtle defilade running east-west across the jagged, semirocky terrain.