I have 5, each saturated with MiliTech. I try to do the bore while it is still warm, or at least before the crud coagulates.
Won't do a thing for the rest of the gun, but they are great for the bore. Wish the .22 rifle had come in time to help break in my .223 tactical; it would have been much easier than pulling / reinstalling the bolt after each shot to treat it w/MiliTech........