larcher,

I'm probably wading into deep water by making this comment.

I'll preface by declaring before the Creator and everyone who cares to read this post, that I have no expertise with lubricants. Furthermore, I'm not an engineer or otherwise educated in the physical sciences.

Now, having made that disclaimer I will make my comment:

WD40 has to be the WORST product I know of to put ANYWHERE on a firearm. I mean it. It cruds up anything. If used often enough it will cause any firearm to malfunction. On triggers and other small parts it is a disaster. It is made to leave a gummy film, and that film builds and builds. After several years it is hard to remove even with strong solvents.

The only thing WD40 is good for is removing road tar from the fender of your automobile.

Having given you my adamently negative opinion, let me say something positive:

For a rust preservative use RIG. It is an age-old product made specifically for that purpose. It is sold by Brownells and is available in many sporting goods stores. A little goes a long way, and if you are like me a small can of it will last you for years.

I don't own stock in, work for, or have any interest in Brownells or whoever makes WD40.

Just my $0.02 worth!!!

Best to all,
CptCurl