Storm Bolter

The storm bolter is a double-barreled version of the bolter. As it is heavier and causes more recoil than a normal bolter, it is even more rarely used than the bolter in an Imperial Guard army. Instead, they are usually used with Space Marine Terminators or as a tank's pintle-mounted weapon. They are also used by the Grey Knights as a gauntlet-mounted weapon with its feed rallied to the rear of their armour. Also, many combi variants exist, such as bolter-flamer, bolter-melta, and bolter-plasma; these combine a bolter with another weapon (ie. a combi-flamer combines one with a flamer). While the bolter carries as much ammunition as found in stand-alone bolters, the secondary weapon carries only enough munition for one salvo. Due to high munitions consumption, and the lack of dexterity in Tactical Dreadnought Armor, most Storm Bolters are fed from a large box magazine, carrying approximately 100 rounds. These rounds are identical to those fired from bolt pistols and boltguns.

Before the Storm Bolter was created by the Tech Priests, Terminators were often equipped with special boltguns that had advanced targeting equipment and restricted firing rates. These were called combi-bolters. They are only used by the Chaos Space Marine Legions now.