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this si the most realistic thing i could come up with based on materials presently at hand. keept the weight to under 50 pounds. The canteen and water in the backpack represents my camelbak
A break action shotgun would be one of your best bets for a 'non warfare' scenario. Shotguns are a utility tool. they can shoot a lot of different stuff out of them, and a break action can handle much more powerful loads than a pump action. it also helps conserve ammo