9 lbs is pretty descent bro. And do you think its a lot of water or lbm?? From what u can tell..
arms are tricky imo. I go back and forth from not doing direct arm work to hitting them dogs daily. I think between the two logics something is working....slowly. I do believe to really add size to arms u need to gain overall weight tho. Thats a tuff one for me, because like u, my job is so damn physically demanding/draining, which makes it hard to get enough calories in/ day to make real gains. And believe me, I eat a ton!! <Mostly at nite after work day is done.
Keep up the effort B!