The long awaited HK .177 caliber blowback action model
By Dennis Adler
Having established the DA and SA trigger pull to be within an ounce of the average trigger pull on the centerfire HK USP standard DA/SA models, it is time to run a velocity check and see if the power needed to work that very impressive slide diminishes the average speed at which a .177 caliber steel BB travels downrange. I’ll also be keeping a count of shots per CO2 cartridge. A gun that delivers performance on both ends of the scale has to give up something. Or does it?
The centerfire HK USP model is manufactured in 9mm, .40 S&W and .45 ACP versions with magazine capacities of 15, 13 and 12 rounds, respectively. The USP is a traditional hammer-fired design, as is the CO2 version, which perfectly duplicates the centerfire model trigger and hammer configurations. The white dot sights proved excellent for both outdoor and indoor testing.
FPS with steel
First, let’s look at the HK USP magazine design. If it looks a little familiar, and you have an Umarex S&W M&P40, you’re right, almost the same design but shaped to fit the HK, same heavy follower spring and yes, the same tiny follower legendary for torturing fingernails. The difference is rather than a loading port barely larger than a BB, the HK has a loading channel exposed when the follower is pulled all the way down. And like the M&P magazine, you have to hold the follower down the entire time you are loading. This is the best reason I know of to invest another $85.98 for two more ($42.99 each) HK USP CO2 BB magazines. I figure even with the cost of the air pistol, around $100, an extra pair of magazines, and either the HKparts red laser or Mil-Std. 1913 rail adapter (roughly another $30) you’ve just broken the $200 line (actually $215.98 less applicable taxes and shipping) for one of the best new CO2 blowback action pistols of the year.