| 摘要 |
A visual aid comprising: (a) a frame having a fastener allowing selective coupling of the frame to a barrel of a firearm, the frame having a trigger end, a barrel end opposing the trigger end and first and second opposed lateral ends, the frame having coordinate system comprising, (i) a longitudinal axis running through the trigger and barrel ends of the frame, the longitudinal axis having a positive direction from an origin on the frame towards the barrel end and a negative direction from the origin on the frame towards the trigger end, (ii) a lateral axis running through the first and second opposed lateral ends and perpendicular to the longitudinal axis, the lateral axis having a positive direction from the origin on the frame towards the first lateral end and a negative direction from the origin on the frame towards the second lateral end, and (iii) a vertical axis perpendicular to the longitudinal and lateral axes, the vertical axis having a positive direction above the frame and a negative direction below the frame; (b) a first mirror mounted to the frame and facing in a direction having a negative longitudinal component and a positive lateral component and having an angle with respect to both the longitudinal and lateral axes; and (c) a second mirror mounted to the frame and facing in a direction having a negative longitudinal component and a negative lateral component, and having an angle with respect to both the longitudinal and lateral axes, where the first and second mirrors provide two substantially lateral lines of sight to a viewer positioned distal from the trigger end of the frame and parallel to the longitudinal axis.
|
