Mr Gall:
I wonder why you want to take the gun to bits? A 20-bore in good condition is not something that a first-time home hobbyist should be learning on. In oher words, if you have never disassembled a boxlock double before, you should think twice about a Parker 20. Do you have proper turnscrews? Do you understand that screw slots must be cleared before you use them? Do you understand that the sears must be removed (tricky) before the buttstock can be removed?
These are just a few of the considerations in stripping down a Parker. If you want to clean it, then the small fee for a professional strip-and-clean will be more than worth the outlay.
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