The rarity of Exact Marksman is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Exact Marksman is a skin for Sniper. The skin was added to the game on July 30, 2015, it was created by K-Pax.
Exact Marksman has been recently added to the game, which makes it rather popular with the game community.