I have an M2 tac, and when I activate the little button beside the trigger guard to eject a shell onto the loading gate half of the time the shell will hang up and won't go on the loading gate. So I guess I have two questions where and what spring do I need to get so the lever will get out of the way and the shell will go on the loading gate. The second question is how often should I change out most of the springs in my shotgun? I know this is a open ended question with round count and what not, but lets say I have shot 5,000 rnds , and reloaded it about another 2,000 with dummy rnds.