It is a long term lubrication put in at the factory to ensure that there is some lubrication in the weapon at time of purchase. It can be removed as long as you properly lubricate and clean your Glock. We do offer this long term lubrication in our catalog in our cleaning section. I have heard that Glocks never have to be cleaned or lubricated. The Glock's reliability is legendary and you could probably fire it hundreds of times a week for decades with ever having a problem. However, it will function better, last longer, and shoot straighter if it is cleaned after each use.