Metal games workshop miniature, older sculpt called "Tyrannic War Veteran.
Background on the mini from Warhammer 40k wiki:
"A Tyrannic War Veteran is a Veteran Marine who is a member of the Ultramarines Chapter's newly formed strike force dedicated to the eradication of the Tyranid menace from the galaxy. The Tyrannic War Veterans were forged from the remnants of an atrocity committed by Hive Fleet Behemothagainst the Ultramarines on their homeworld of Macragge in a series of campaigns collectively known to history as the Battle of Macragge. During the Battle of Macragge, a good portion of the Chapter was heroically sacrificed to stop the menace of the Great Devourer during its first incursion into theMilky Way Galaxy. Numbering only in their dozens, these Veterans are experts in the art of Tyranid warfare, and have saved many worlds from being completely devoured by the Hive Fleets. Whenever Tyranid bio-horrors begin to ravage a planet, these Ultramarines can be relied upon to strike a blow back against the swarm. Often in the face of impossible odds, they launch disciplined strikes against monstrous horrors and shred incessant bio-forms with a blaze of Bolter fire. The presence of the Tyrannic War Veterans is enough to rouse other Imperial forces to achieve great deeds in their darkest hour."

Source: http://warhammer40k.wikia.com/wiki/Tyrannic_War_Veteran

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles

Tyrannic War Veteran, Various Angles