Glock 18C would be good, especaily if you stuck the optional stock in his backpack. Also, why the Barret .50? it's huge, uses massive rounds, and atracts too much atention. You should be somewhat inconsicuous, and the big .50... I don't know. It seems like the wrong gun, even if he is a giant. Try a Galil sniper, an L96, Remmington 700.
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