Trick Low Grade Weapon Win for Skulls Attack FOB Event in the game Metal Gear Solid V: The Phantom Pain. Learn how to use the mortar to achieve all 7 tasks in one FOB Infiltration on any Skulls Attack FOB Missions event. Use this technique to quickly get Event Points to trade for S++ Soldiers or those unique uniforms, base camos, and emblems. All weapons used in this video are Grade 5 or below, but the main weapon used to defeat the skulls is the Mortar located on the second floor of the Base Development Pl
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