Allowing the barrel to protrude from the windows gives away your position.
I don't know if starlings can figure that out, but they might.
Yeah, but allowing the barrel to protrude gives me the ability to rest on the stock and not directly on the barrel.
The starlings so far haven't seemed to notice the barrel. I have sheets keeping the draft out, so when it's not raining I can just leave it out there. Better than opening the window, they know that sound.