I still think they should call it a "Performance Package" rather than an "Accuracy Kit". I did a test using a Mark IV Competition Target installed in my Ransom Rest. Shot five groups with SK Match Pistol ammunition with the pistol having all of the factory components intact.
Then, I shot five groups with the very same ammunition, only this time with the "full blown" accuracy kit installed. Couldn't detect any improvement in accuracy, or group size, that was even measurable.
The before and then after trigger pull, weight measurement, did indeed improve, but to me that's more of a better "performance" function, to possibly help the shooter perform better.