Most Stalker-pattern bolters are found among the Ultramarines and their respected successor chapters. This Stalker came to the Blood Ravens after Captain Armand led a chapter detachment to help liberate the Sabbat Worlds.
It is a two handed bolter.
It is a level 15 piece of wargear.
It gives the user +14% accuracy.
It gives the user +55% suppression resistance.
It can only be equipped by the Force Commander, Tarkus, Cyrus, or Thaddeus (with a trait).