Shodd,
Make sure you don't get an accumulation of WD-40 inside your bolt and any enclosed trigger assemblies. They won't rust, but they will get gummed up.
The best solvent for gummed WD-40 is fresh WD-40, then remove that with Quick-Scrub or brake cleaner and then use a synthetic product intended for guns.
If you doubt this, partially fill a beer cap with WD-40 and leave it on a shelf or windowsill for several weeks or months and see what you wind up with.
You can use the search feature to see what people have said about WD-40 over the years. You will also read about the fellow that got WD-40 on his scope lens and it ruined his lens seals.
WD-40 is good for many things, for guns not so much, in spite of what the can says. A can of WD-40 and a Bic lighter does make an impressive zombie repellent.
