GR translation: stripped to toggle links and oil pump littered about the dusty room

[Mike Jing]

V106.5-7, P 108.7-9  . . . in a block of old flats with rain in the
courtyard and a bulky, ancient Schwarzlose stripped to toggle links and oil
pump littered about the dusty room—

What's littered about the dusty room, is it "toggle links and oil pump",
just "oil pump", or other parts stripped from the ancient Schwarzlose? Or
does it refer to the stripped Schwarzlose itself?

Also, does "with rain in the courtyard" mean it was raining at the time?
The published translation thinks it refers to rainwater on the ground,
which doesn't seem right to me.