Guys,

When you reinstall a Mauser barrel do you put any lubricant on the threads? If so, what do you use?

Thanks!

No. I just make sure the barrel & receiver threads are squeaky clean.

I'm sure there will be a lot different practices for this. I've heard light oil, Never Seize, LocTite, nothing at all, etc. All I know is most of mine need bluing after installation so any contaminant is an issue. If there is no finishing involved, I wonder if it matters?

I clean the threads real good and apply Break Free prior to assembly. If the action and/or barrel is stainless, I use anti seize.

I use barrel assembly paste that brownells sells. Looks like a stiff grease with moly in it. It would probably act as a contaminant if if I was going to reblue the rifle.

Heat from friction causes galling. With a Mauser, you are likely not working with stainless steel, so galling isn't quite as likely. The most critical thing you must do to avoid galling is to make sure the threads are clean. Any moly based or high temp grease will suffice if the threads are clean. You don't need to overdo it, just a little on the threads and shoulder.

I always use a thick anti-sieze lubricant from the auto supply store, Permatex I think.

I always true the receiver and all mating surfaces so I have never had a problem with bluing contamination or salts creeping out later and I have fitted and hot blued a lot of them.

I always scrub the threads real well then dry them off thoroughly. Not need to use oil or grease unless the action does not thread on easily. As others have mentioned, any substance you use may contaminate if you must reblue. If not, a little grease will not hurt anything but is not neaded, niether is locktite if barrel is torqued properly and shoulders are making adequate contact.