I have Three Porter Cable , two FN250A Finish nailers and one NS100 stapler. they all leak around trigger when it is depressed, Do these need the Full kit that they sell? I hope I am making since....I am willing to rebuild them all but there are so many different parts or kits..

If they sell individual o rings for the trigger area I would try them first, BUT generally if these tools are older and used, it would be to your benefit to rebuild them when apart, it doesn't take that much longer and then you know what you have. In rebuilding make sure to clean all the debris out and lubricate the o rings with a dab of grease before reassembling. Let me know if you need more assistance.