An automatic injection training device is presented having an elongated housing assembly and a demo container. The device further has a reloadable plunger assembly comprising a hollow plunger, a piston rod, a first energy accumulating member arranged between the hollow plunger and the piston rod and an actuation assembly configured to hold the hollow plunger in a first position and thereby the piston rod in the start position and to release the hollow plunger from the first position and thereby the piston rod from the start position. The hollow plunger can have a chamber sealed by the piston rod, and a passage; such that movement of the hollow plunger from the first to the second position by a force exerted from the first energy accumulating member causes an airflow into the chamber through the passage whereby the movement of the hollow plunger is dampened.