Are there generally legal issues if modifications have been made to a CCW that was used in SD ? I have been considering installing a Ghost trigger connector for a better fell and less slack, but am a little concerned. I also use my carry gun ( glock 23) in IDPA. Should I save modifications for a dedicated competition gun or can I have the better of both worlds? Thank you for your valued opinion and taking your time to help us all here. P.S. Which of your books would you recommend to start with? They seem to be required reading by most.