GTA Online: Gunrunning - Secret Alien Egg Supply Mission (Legit Way) ─ GTA Series Videos

How to unlock the secret Alien Egg supply mission in GTA Online: Gunrunning

To achieve the goal in the fastest time possible we divided the team in three sub-teams (also with the help from some of our friends) working at the same time on sales, supplies and crates due to the fact that one of the required variables was the number "600".
Since we had our doubts on what the number was tied to, with almost a week of non-stop 24 hours grinding taking turns, we all reached the number 600 in sales, supplies and crates, and then we continued trying to unlock the mission during the 21:00-23:00 time frame.

In order to trigger this mission you have to complete at least 600 resupplies. Once you have reached this number, start a new supply run between 21:00 and 23:00.

Apparently there's no timer for this mission, nor rewards or unlocks for completing it.

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Video recorded on: PC with all maxed out settings

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