I just bought my first shotgun, mossberg 500 tactical and i have a question. Inside the tube where you load the shells there is a wood stick with 2 o rings on it. I think its called the drum stick. Is that to limit how many shells you can insert at one given time? Is it bad if you take it out and leave it out? Is it just suppose to float inside the tube, or have to be at a certain spot for the gun to function properly.