Upper arms Halo Arbiter: http://minimatedatabase.com/figure.php?i=1382&n=Arbiter+(Ripa+'Moramee)
Lower arms...I don't remember. I went through my "video game" bin which has Halo, Tomb Raider, and Pathfinder/Dragon Age. I think they're all from there? I tried to use Hale Caesar's arms at first, but the skin tones didn't match, so I gave up. Maybe the lower arms & gloves were from my "movies/TV" bin with Kill Bill, BttF, Gotham, Godzilla?