All you need is the 3 weapon parts and the manual for the OICW. First read the manual, then make sure you have all the parts in your inventory. The code for the assembly is very straight-forward, it check if you read the manual and if you have the 3 necessay items in your inventory. If it says you need more parts, that means you don't have the right things in your inventory.
To get access to the mission you need to kill more than 500 enemies, once that's done, talk to Jim-Bob at the harbor.
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