I would try acetone It works great to strip off old finish and it is reletivley safe, but very flameible, use in well ventilated space. Try to use a tightly covered container-it evaporates fast. good luck

Removing GOO From Wood & Metal
 

I think I'd try to soften whatever the GOO may be by passing the parts thru the steam escaping from the spout of a tea kettle ... Once the GOO has softened, you should be able to remove it by wiping the parts with a cloth.

Jim Kucaba ... AriZOOna Cactus Patch ... Email: JimKucaba@aol.com

Keep us posted maybe a picture? What a cool gun does it have turnips (ducks) if so i'm jealous of who ever gets the ol stright grip flying turnips or not. best ch I agree with Roundsworth hes cleaned metallices that way and it don't even scratch the brass.