Board Thread:General Nerf discussion/@comment-30830864-20170330005303/@comment-29595756-20170330040014

I'm not sure exactly what you are asking but I do have some knowledge with water guns. If you are trying to fire them without water and just air, certain types of water guns won't give you a sign that they are working. (I'm assuming you tested them in the store but for obvious reasons didn't fill them with water.) If you have tried filling the tanks with water and they still wont work even when fully pumped, it could either have a leak as BigS suggested, or it could have a faulty pump. One other thing I've noticed with some designs is that it is possible to over pump them and they will not shoot. Try filling them half full and pumping them up to see if that works.