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If I have a LV Gamma Disruptor Launcher on Shockwave and play a Dual Wield for my turn, giving Shockwave another Weapon slot, and I play another LV Gamma as my upgrade for the turn, then attack. Since 2 LV gammas are allowed in one weapon slot, I presume the one attached by Dual Wield will stay on as well?

Yes.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Dual Wield, LV Gamma-Disruptor Launcher