If you want to take off the sights then the rear is held by the elevation wheel and a screw at the front of the spring steel plate. The front sight (early model I guess) is alloy. You will need to undo and remove the small screw on the side that nips it up and then tap it off the barrel. Remove the two front stock screw and the 2 rear ones on the trigger guard and lift the action out of the stock and remove the plastic end cap. The cocking arm can be lifted out of the slot in the cylinder but remain connected to the breech block. Undo the barrel pivot screw and remove the barrel. Watch out for the plastic washers on either side of the breech block. If you want to clean and lube the plunger and spring, do it now. You need to knock the small tube that passes through the breech block with a punch. As you withdraw the punch the plunger and spring should fly out. Clean and lube and replace them and refit the tube and the 2 plastic washers. You will need a 10mm spanner to undo the stock nut/trigger nut from the captive bolt that passes through from the inside of the cylinder. Look how the trigger spring goes (one leg behind the trigger and the other pushing against the inside of the cylinder. Undo the nut and remove the trigger set up and the captive bolt. Go to pt2