The two most notable areas where HK beavered away on the P30 is the frame. It features less agressive front and backstrap texturing, paired along with adjustable backstraps (IMHO, a state of the art MUST HAVE when it comes to service pistols). Second was the rail interface, that now adheres to MIL-STD-1913 Picatinny spec. The USP had a proprietary setup. Shame when you realize that that the USP was the first poly service pistol to incorporate a rail.
As a whole, I wouldn't worry about mechanical accuracy if it bears a HK badge.
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