Final answer:
In prone position, the butt stock should be placed in the 'pocket' of the shoulder below the collarbone and beside the shoulder joint for stability and accurate aiming.
Step-by-step explanation:
The question pertains to the correct positioning of the butt stock when in the prone position, which is relevant in the context of shooting sports or military training. In prone position, the butt stock should be firmly placed in the 'pocket' of the shoulder.
This is the area slightly below the collarbone and beside the shoulder joint. It is essential for stability, recoil management, and accurate aiming. The placement should allow for a comfortable and steady hold while ensuring that the cheek is resting against the stock in the same place with each shot, providing a consistent sight picture.