"I use WD-40 for this." by JIMMYRAYTHOMASON
Jimmyray, you should never use WD40 on the internal mechanisims of a firearm. It leaves a sticky film that attracts and holds on to dirt and powder residue, especially in trigger groups and firing pin channels, that unless cleaned relativly soon will harden and be next to impossible to get out. I have had customers bring their hunting rifles and shotguns to me because they would mis-fire, and after breaking them down, I would discover hardened crud built up in the bolt, and other places. But after a through cleaning with Hoppes #9 and hot water, they work fine. When asked, the customer said they used WD40 in the gun for lube. I use Hoppes oil or Rem oil. Wiping down the outside to prevent rust is fine, just keep the WD40 on the outside of a gun.