The highest factory magazine capacities for the HK USP are:
HK USP Magazines
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Frequently asked questions about HK USP magazines
What are the highest factory magazine capacities for the HK USP?
What benefit does a finger rest serve on a magazine?
You may notice that a few of the HK USP magazines have finger rests at the base of the magazine. These help the shooter maintain a more secure grip and increase the level of control when shooting.