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The radar gun won't be accurate because the slide's speed is not constant throughout the cycle. Velocity peaks just before the slide impacts the receiver, and is considerably lower on the way back into battery.
We know that Glock slide assemblies are lighter than USP slide assemblies in the same caliber. That much is clear to anyone who has field stripped both. If you hold recoil spring force, loads, and firmness of grip constant, there is no way that the USP can have a faster cycle time than a Glock of equivalent barrel length and caliber. There is surely a small difference in the distance each slide travels to the rear, but not enough to make a difference.
I wish I could find those slide assembly weights! Google is failing me tonight...
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