How do you remove the fore slide on a Remington 870?

Make sure the shotgun is empty. Look in the chamber and the magazine tube. Pull the slide back and remove the end-cap and then the barrel needs to come off forward and out of the receiver. Slide the forearm forward and reach a finger into the right front side of the receiver. You will feel the right side cartridge guide. Push that up against the right side of the receiver wall while sliding the forearm forward and the forearm will come out of the receiver along with the bolt. Assembly is in reverse order.