I was emptying out a box and came across the stuff that was included with the BB gun that I bought this spring. There's a baggie with little dull silver mushroom-shaped thingies, and I simply canNOT remember what they're supposed to be used for (as opposed to the little round copper pellets which I've been using ever since getting the BB). Help me out, would you? And try not to make fun of me. This is my first BB gun ever What's the difference between the mushroom thingies and the round things?