From what I remember Luke carries the Full Port mauser on Dagobah except for the beginning when R2D2 falls in the swamp and he's running around with what looks like a stunt casting. For example inside Yoda's house you can see the port well and it looks like a complete circle.
That's why I'm not too keen on calling them "Luke's" and "Han's" ...
But Dagobah scenes are all shot in bad light so it could be misleading as details like the step on the port could simply be lost, especially considering that it is not in focus most of the time.