How can I buy a specific lot of pellets? I bought some mk1 from AOA and they were the perfect fit for my impact. When I placed the order they were 4 tins and out of 4 there were 2 tins that were shorter and they fit smoothly into the berral. The other to were a tighter fit and shot terrible. Can I just call AOA and tell them I want these specific pellets will that work? They were all mk1 pellets just 2 different sizes?