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Lets say I have exactly 7 cards in my hand when I flip Sergeant Springer to bot mode. Its ability triggers and I play an Action. Now I only have 6 cards in hand. Do I still get to play an Upgrade?

Yes. Once the ability triggers, youll do everything it says. The trigger condition doesnt recheck in the middle.
Source: Wizards of the Coast (2019-11-08)    【Link to Ruling】
Tags: Sergeant Springer, Special Ops • Aerial Defense