Madness Interactive Shell Ejecting Thread

I have made a mod for the basic Madness Interactive game and I've included a bolt action rifle. The animation is fine but I don't know how to delay the shell ejection. To be more realistic there should be a slight delay between firing and the shell coming out of the gun. Can anyone help me? I am new to the forum so I apologise if this is either the wrong place to post this or if this is not the sort of thing people help with.