I am in the same boat you are in with the barrel swap. I decided to break down and just buy the tools so I am willing to help you out. The only thing is I probally won't be able to do it until after Christmas. I am in Littleton by the way. Also something to think about once you have the barrel off and provided you have a full 16" barrel, you can take it to a smith and have it cut down to 14.5" and then have a permanently attached flash hider installed on it like a phantom or a vortex. That is what I think I will be doing with my M4 barrel. CHeaper than buying a new barrel. Let me know...