I just opened my "The Judge" and in my first Nerf battle, the slide on the bottom of the gun jammed and now it won't prime at all. It slides back, rotating the barrel, but it will not continue the cycle and prime the spring inside. I think the spring inside is misplaced inside, and I tried to take it apart, but the smallest screwdriver we have here is slightly bigger than the screw(s). Could someone please tell me what screwdriver size I need, and give me advice? Thank you.