Cleaning it should not be a problem..if you can have someone make up a bore guide so much the better though. I would use a plastic coated rod and be careful with it as well. Have you tried Wipeout yet? That could be useful in cleaning out this gun as well. You would shoot the foam in from the muzzle end and it should probably end up in the chamber as well whicch is a good thing since you want that clean in an auto. Its advantage would be the number of times you have to run the rod down the bore to clean it. I would say two wet patches of whatever bore solvent, dry it out with 2 patches and then run the wipeout thru it. If it still needs cleaning then use a bronze brush with your favorite solvent for about 10X or so and then dry it out.