I'm trying to make a reload Animation but when i set child of influence of magazine at start of animation at 0 and press I to record keyframes , and at ejecting part of animation when i set it to 1 and press I to record keyframes again nothing will happen it will always stay at last value i set it.
It's looks like you set the transform keyframes. To set a keyframe for influence, hover the mouse cursor over the influence value setter and press I.
Another way to do this - press dot icon over the influence value.
If the keyframe is setted, the value slider turns yellow.
Important: make sure, that final medium supports Blender's constraints