Here you go! Guy on the left is still in the middle of being base coated.
On the left is an Intercessor with a powerfist arm and pauldron from the space wolves pack box (5th edition. Is the current one the same or different?) On the right is Intercessor with Grey Knights Nemesis Force Sword under an Intercessor pauldron. The GK swords are longer than regular power swords and help the arm not look short. I also have a SW powersword on a wolfed up Phobos Rune Priest, but that was cut off at the hilt instead of the arm, so I didn't think it would answer your question. There are a couple more, but they're currently broken up for magnetization.