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A mantis will have really big-bug-out eyes. I don't see those in the picture. A pistol has one claw bigger than the other. I don't see that in the picture either. I'd hold that bugger aside until you get a proper ID on it.
The picture color is bad but he is a scarlet red. His eyes are not that big but he did pop my glove a few times when I caught him. I just put 350lbs of rock in my tank I am tired.