So how do you do it? I got one for Christmas, used of course. It had been bought new by my step father about 20 years ago and my wife bought it from him. He couldn't locate the owners manual so I'll have to contact Marlin for one but in the meantime, I'd like to take it apart and clean it. The gun is like new. He says he took it out once and put no more than 15 rounds through it.