I'm not a huge gun fan, nor have I ever played Titanfall, but this Smart Pistol MK5 by Nick Brick caught my eye. I don't know how accurate it is, there seems to be a bit of a lack of reference images, but I think that's even more impressive if a good percentage of this is extrapolated. And you all know I can't resist a good LEGO Prop.
UPDATE: Nick Brick assures me that it's accurate. He also pointed out that the game isn't out yet (so I have a great excuse for not having played it yet)