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| | Encyclopedia: HK USP (Site not responding. Last check: 2007-09-17) |
 | | The USP was originally built in.40 and 9mm models, but later evolved into a.45 variant and later spawned the USP Compact series, which is available in 9mm,.40 SandW,.45 ACP, and, exclusive to the Compact model,.357SIG. |
 | | The USP barrels are a polygonal profile to further increase muzzle velocity and barrel life During testing, a bullet was deliberately lodged in a USP barrel. |
 | | During the USP testing phase, it was shown the recoil-reduction system reduces the force on the USP grip to approx. |
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