As per title, add a sitting stance shooting position
Something like the attached picture.
The purpose is to have an alternative to prone for long range shooting when grass is too tall (often happens) or the ground does not let to get prone.
Stance characteristics:
- hard to change position: Standing up should be as slow as prone
- standing or very slow moving: Moving should not be possible, or at most, very very slow, usable just for minor adjustments.
- Arm stamina drain as prone: Same arm stamina drain as prone