Coalcracker, if you want to use a car wax on your rifle, and you want it to contain carnuba, the best carnuba wax in the world is Zymol. Zymol makes a variety of car waxes, and their entry level waxes contain
yellow carnuba, which is less expensive than their
white carnuba waxes. Their waxes aren't cheap, and they are not for everyone, but once you use it on your car, you will see why it's the best car wax in the world. Myself, I wouldn't use a car wax on any of my rifles. My M1A has a stainless steel barrel, so it won't rust. My two Henry Rifle Golden Boys, state that you should never use any wax or polish on the brass sections of the rifle, but to instead, just wipe them off with a soft cloth.(I use old 100% cotton tee shirts.) As for the Zymol, I have used this wax on a number of my cars over the years, and it gives the best shine that I have ever seen. They used to offer a sample kit of their white carnuba waxes, so I bought one. If anyone should decide to try the Zymol waxes, keep in mind that you have to remove any old wax that is on your car first, otherwise you will just be waxing the wax. They have something that's called HD Cleanse. That's what you need to remove the old wax.
Anyway, I am not a spokesman for Zymol, and I am not being paid by Zymol to mention this, I just wanted everyone to know what the best wax in the world is, since I've used it, I still use it, and I have never found anything else that compares to it..