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If I play a Weapon on Megatron, do I have to choose which slot it’s going in?

No. As long as Megatron can hold all the Upgrades attached to him, you don’t have to specify which
slot anything is in. For example, if Megatron has two Weapons and a Utility, and you play an Armor onto
him, you can choose at that time which Weapon it will replace.
Source: Wizards of the Coast (2018-10-11)    【Link to Ruling】
Tags: Megatron, Living Weapon, Megatron, Living Weapon