It is like really short almost like a sawed off shotgun, mabey bungie made it shorter ( reminds me of marathon 2 ) to enable him to hold it with one hand. but having two shoties is going to be hella tight.
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people are saying that it is the battle riffle, but if you go to the render pics for halo 2 and look at the battle riffle, you can see theres a long tube at the end of it, but in the multiplayer shot its short, so i went back to the renders at theres another gun, it looks like its a sub machine gun, now when i went to look at the multiplayer pic again, i zoomed in on the gun and it looks exactly like that sub machine gun so im pretty sure thats what it is