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20 G

So, the best way to do this is to go in the back room of the safehouse, climb up the ladder, and go grab the sniper rifle that's just sitting there for you. You, could also go unlock the hunting shop and grab some assault rifles too but you probably won't need them. Now, just hide behind the cars in the middle during the fight, and take him out one shot at a time Should be simple enough.

Happy scouting!