which part of the rifle initiates the shot when it is moved?\n- trigger\n- action\n- bolt\n- safety

Brief Explanations:

The trigger is the part of a rifle that, when pulled (moved), initiates the firing mechanism. The action refers to the overall system of loading, firing, and ejecting cartridges. The bolt is involved in chambering a round and locking the breech. The safety is a mechanism to prevent accidental firing.

Answer:

Trigger