GTA Online Bunkers were added as part of the games Gunrunning update back in June 2017. This wasn't all Rockstar added at the time, there was also plenty of new military-themed vehicles available at Warstock alongside the Mobile Operations Center.
But the biggest addition was clearly the bunkers, which acts as your base of operations for all Gunrunning related activities.
Those new to the game should also note that to buy a bunker (which grants access to the Gunrunning business) you'll need to be either a VIP, CEO or Biker Club President in GTA Online. GTA ONLINE HEISTS - The Fleeca Job Heist Payout | The Prison Break Heist Payout | The Humane Labs Raid Heist Payout | Series A Funding Heist Payout | The Pacific Standard Job Heist Payout |
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