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Do It Yourself asks you to fill every mod slot on one Resolver Weapon, the scrap-built specials from Juan's workbench. Pick one cheap weapon and pour your materials into it.
1. Go to a workbench. 2. Pick a Resolver Weapon you already own. 3. Unlock and attach a mod to every slot it offers. 4. The trophy pops when the last slot is filled.
Choose the Resolver weapon with the fewest slots to save materials. If you are short, loot FND caches and strip parts from vehicles. You can swap mods out again afterwards; the trophy stays.
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Unlock all weapons in Pagan's Armory (solo only).
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Equip a full matching Gear Set.
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Unlock all weapons in Vaas' Armory (solo only).
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Have 10 parts installed on a Ride.