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Shouldn't that take care of it?
When i remove the cap to take off the barrel there is just a hole where the magazine tube is.
CAUTION: The magazine spring exerts pressure on the retainer. Use caution when disassembling.
To disassemble: Pry up at various points around the small hole in the
center of the magazine spring retainer. Cup hand over retainer and
magazine so as to keep spring and retainer confined. Use caution not
to bend or distort the magazine tube end and or threads.
I have never heard of buttstock removal as a requisite for properly cleaning a shotgun. Are you tearing it apart for kicks?