Think that the new trigger handle would need a new motherboard or how you would explain it. Since it has the slow start feature on the mkII and don`t think that the mkIII has that. If it has that it could be that you could switch the trigger handle if also the trigger unit chip is in the handle. And it`s the same mounting points. Then a new top handle cover for the rubber holds.
Or take a chance and DIY and ad another I to the mkII. Send it into a service for the $85. And they notice they have have send out a non upgraded mkIII LOL
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