Sure fire method this, this is what i used to do....
go to B&Q and buy a small file. Now starting at the end of the barrel, slowly rub at the metal with the file. Keep doing this until you reach the body of the cocker. You should now have a barrel-less gun, and a pile of metal dust. Next, cover all your inserts with a thin layer of Gloy glue ( the kind we used to eat as a kid) and roll them around in the dust, thereby coverng them in a chrome outer layer. Your work here is done.
come to think of it, that's a **** idea.....
Cook$™
n.b. I accept no responsiblity if you are actually dumb enough to carry out any of the above instructions.... except for going to B&Q, that wont do your barrel any harm. Unless you take it with you and it gets run over by a trolley or something.....
n.b. I accept no responsiblity if your barrel gets run over by a trolley...