Here all you need is two cable wall tacks that are 1/2 inch wall tacks hot glue and a cutting tool that can cut nails Remove the nails from one of the wall tack flip the one with out nails to the flat side and put it behind the trigger on the bottem where the frame and the corner of the gun meet heres a pick
http://img71.exs.cx/img71/8915/PA280029.jpg
Then apply glue and your done It works well went from 4bps to 11 so it does work