One of the first upgrades to my rifles has been to switch out the phosphate coated bolt carriers to nickel boron due to its lubricity as a coating. However, after having them cerakoted with both of these products, especially the micro slick, I find the function of the rifles to be even smoother and the lack of residue on the carriers after a range session is wonderful. Even nickel boron carriers would collect some decent fouling near the front. That isn't the case with these, the color is still rich and the coating still looks new. Definitely recommend these products in the hands of a skilled applicator such as this one.