I didn't think it was ambiguous at all. I felt it was obvious he was a war machine that had amnesia based on the giant dent in his head, that scene where his eyes start to turn red for a minute while looking at the gun the hunters dropped in the woods, and then again when his eyes go red and he fires his laser after looking at the toy gun Hogarth is playing with.

As a side note, I just now went to look up some other scenes from the film and I saw some really great youtube comments.

Watched this movie with my 4 year old. Promptly threw it in the trash afterwords. At first I just disliked the movie, and decided I didn't care for its anti gun/ anti hunting parts of its message. Then my daughter decided to tell me as I took a gun out pf the safe to oil it that guns are bad and guns kill. This movie is now in the trash where it belongs.

And also this one

Masquerading as anti-violence, yet another serve up of the duality of movie studios as they slam home the anti-gun/hunting message to children. Brought to us by the same Warner Brothers that lined their pockets with millions from smash hits such as: Lethal Weapon, Under Siege, The Matrix and many other bullet-flying, blood splattering gore fests. First create the image of reckless and irresponsibility of gun ownership, then fund a moral tale to vilify the very thing you've created.

So a kid explains that guns kill things to an alien that is ignorant of the concept of both guns and death. The kid then gives an impassioned speech later on to the enraged alien about how hurting people is wrong and that even if you are quite literally a sentient gun, you don't have to be a killer.

None of that was a kid friendly message of being anti-war, anti-violence, anti-xenophobia, or choosing your own destiny instead of just being what someone else intended you to be.

A child was saddened upon finding a dead animal and says guns kill things?

A literal gun was taught how to use it's power to save lives?

Propaganda against responsible gun owners/hunters.