Well, it's not really a trick, but it does seem to take a bit of effort if you haven't done it before. Remove the barrel and turn the gun upside down. Looking at the loading gate, push your thumb on the right side bar/lip (you'll feel it move in), while pulling gently on the forend. Then, while still pulling gently on the forend, push the left side bar/lip(it too should move in). Sometimes you have to wiggle the forend around and push the other bar/lip in again - but, it will eventually allow the forend to slide out. Turn the gun right side up before you pull the bolt completely out, then remove it all the way from the action.