On more than one occasion I have had someone bring in a disassembled gun with the parts in a shoebox. After getting everything back in its proper place I find more parts(screws,springs,etc.) still in the box. Thinking I may have missed something, I take it apart again and then reassemble. I finally give up and call the customer. He tells me that he wasn't sure if all those springs,screws,etc. went with that gun so he just put them in th box to be sure.