adjustable front sight的用法和样例：
- A rear sight of a firearm consisting of an adjustable eyepiece with a small opening through which the front sight and the target are aligned.
- The globe front sight accepts aperture inserts (none included), and the rear micrometer sight is adjustable for windage and elevation.
- Expect adjustable front and rear spoilers plus dynamically opening and closing air intakes.
- Running and back of the front sight isdecentralized to the maximum, as has been generally no methodicalness gun fire.