You need the events to toggle between 1 and 2 first, then 2 and three, then 3 and 1. To do that, you need a bunch of toggleeventenabled events at the end. It's a bit complicated, here's the events:
1: [x]onMinigameSpawn>Player>setInventory>AssaultRifle
2: [ ]onMinigameSpawn>Player>setInventory>Shotgun
3: [ ]onMinigameSpawn>Player>setInventory>SniperRifle
4: [x]onMinigameSpawn>Self>toggleEventEnabled>1 2 4 5
5: [ ]onMinigameSpawn>Self>toggleEventEnabled>2 3 5 6
6: [ ]onMinigmaeSpawn>Self>toggleEventEnabled>3 1 6 4