A rod should have come with your gun. At one end is a triangular portion, which is used for dislodging jammed bbs. At the other end is a piece with a hole in it. Put a small piece of cotton cloth and spray some silicone oil onto this cloth. Push the cleaning rod, with the cotton cloth going in first through the inner barrel. Pull it out slowly while twisting the rod. This will clear any dust or dirt in the inner barrel. You should do this after every game to clean the inner barrel, especially if you have a tightbore barrel. Another way to lube your hop up chamber is to put a few drops of silicone oil into the hole in the magwell where the bbs feed. Shoot about 200bbs through your gun to clean the oil out.
You can check out gun maintenance and problems diagnosis in the KWA M4 manual: http://kwausa.com/downloads/KWA_KM4_Series_manual.pdf
While this is not your gun, everything is pretty much the same with regards to cleaning, maintenance and function. Follow this manual to get maximum performance from your gun.
· 9 years ago