In that scenario the button is the trigger. Trigger is being used not to describe a curved piece of metal you put your finger on but the input device. The oral arguments had a lot around that issue.
On weapons with these standard trigger mechanisms, the phrase “function of the trigger” means the physical trigger movement required to shoot the firearm. Pg. 7
Although it sounds like there maybe be edge cases where specially designed firearms are treated differently if they lack a traditional mechanism.
In that scenario the button is the trigger. Trigger is being used not to describe a curved piece of metal you put your finger on but the input device. The oral arguments had a lot around that issue.See the reply below
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You’re correct went back and reread it:
Although it sounds like there maybe be edge cases where specially designed firearms are treated differently if they lack a traditional mechanism.
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Extending the traditional trigger’s function by adding more and more complex Rube Goldbergian designs just moves where and how the trigger starts.