[dpvu]

I like to use 1-2 drops of the REALLY light silicone oil in every 8-10 mag fills as AI recommends. In addition, I use some slightly heavier silicone oil to ensure smooth movement of my slide and other moving parts. Just a little dab on the rails and also on the hammer assembly keeps things smooth. It doesn't take a lot but if there's some wear marks on it (so metal to metal contact and friction) it's not a bad idea to give that a little oil.