I am getting ready to order some more cleaning supplies and someone recommended getting a Bolt Carrier cleaning tool which cleans the carbon off the bolt carrier, bolt, and firing pin. I was recommended the Otis B.O.N.E. tool or the C.A.T. M4 tool. Has anyone had any experience with them and more importantly are they really needed. I typically use and have had good success with Otis cleaning supplies with my other firearms. Thanks for the help.