psh noise marines? those guys pale and whimper in compaison to the pure WAAAGHHH power's of ORK GUTARIS! also can see they went on a WAAAGHHH on a xenomorph hive earlier....poor bugs mustve gotten overwhelmed by the DAKA DAKA DAKA DAKA!
two things an ork likes, loud klattering noises and the harsh recaoil and effect of their huge slug throwing guns so it only comes naturally to combine the two! And this picture does it perfectly nice work!!!