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Hi Dave and welcome. While I see your point, most aftermarket parts have been tested, and I would assume this would be due to proper spring bottom loop fitment into the grip extension spring retainer slots. Just retain your factory spring should you switch back to the factory base plate. Cheers and stay safe!

That would be a question for the engineers who designed it

That information is given out on a need to know basis. And you don't need to know. 😁