The question infers something that already exists ..... So, I thought of this question in a present and then past tense. At present nothing seems to be on a must have list. Ten years ago, a back-up gun for my back-up gun. Twenty years ago, a new garage to store the skids of cheap shells. And so on ..... Now if the question is more toward a Christmas wish list ..... An immediate start for a new Trapshooting Organization. And ..... many more things that would make me want something "Trapshooting" this year.