Originally Posted by
ToddG
The recommendations here are contrary to my experience with SIGs. While I do not doubt for a moment that following the suggested program will keep the gun running, it's not the best solution IMO.
Grease tends to trap particulate/debris far more than oil. Putting grease on the rails means that a lot of gun shot residue from the chamber/breechface area is going to get blown into the rails and then distributed through the grease over time. The result is that the lubrication properties disappear sooner plus you've created a slightly abrasive compound that is rubbing along the rails every time the gun is fired. If you're in dusty or sandy environments, the problem is multiplied manifold.
SLG and I frequently went thousands of rounds between cleaning our SIGs doing little more than putting a drop or two of decent oil (I use Militec) down the slide rails. Over time you'll see some finish wear on the frame rails and if you're particularly concerned you can also rub a light coating of oil onto those spots.