I see the same things but how else to explain the large pivot at the front end of the forearm? I would assume that the forearm wood covers up the area where the pump lever breaks from the body of the gun.
I also wondered about this but then I started to see not a pivot bolt but instead just a means of fixing the pressed steel 'slide body' to the barrel/tube bracket above it...?
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B In British slang an anorak is a person who has a very strong interest in niche subjects.