By Dennis Adler
Let’s recap the features and advantages of the new Umarex HK USP blowback action model. This is a 1:1 CO2 pistol in the standard HK V1 configuration: DA/SA with safety/decocking lever on the left side. It accepts all of the Universal mount equipment made for the centerfire models as well as the USP Picatinny rail adapter. The Umarex has the identical ambidextrous dual magazine release lever integrated into the bottom of the triggerguard. Developed in the early 1990s for the U.S. Army under the SOCOM project (United States Special Operation Command), the USP uses a polymer frame (injection-molded polyamide). As an historical footnote, Heckler & Koch was the first armsmaker to use a polymer frame, predating the Glock 17 by over a decade with the VP70. The centerfire USP and CO2 model share a common Browning-based short-recoil, locked breech design, that is modified for blowback action in the air pistol, but very close in appearance, operation, and virtually identical for field stripping.