"This is one nice replica of the HK45. In looks, dimensions, and feel it is virtually identical to the real HK45, variant 1 with a few exceptions:
1 - The muzzle - with its orange threaded tip it is closer to the tactical version but the sights are for the standard version. It would have been nice to have included the tactical sights.
2 - Slide - The slide is made from aluminum rather than steel and has a much lighter slide force. A necessary evil as the gas blow-back system probably does not have the energy to cycle the gun with the heavier steel slide and spring. The slide force on a real HK45 is over 17 pounds, I estimate the force on the airsoft version to be about a third of that.
3 - Markings - A minor point. The real HK45 is made of German components assembled in the USA. It should be marked as 'Made in USA' - not 'Made in Germany'. The serial numbers do not follow the correct HK format.
The Umarex KWA HK45 in operation: As far as the operation of the HK45, it's the real deal. All the features of the variant 1 are replicated exactly. The control lever performs all of it's functions correctly. And the inclusion of the HK lock-out device is a nice touch. The accuracy is great and repeatable in rapid fire. The trigger pull is a bit lighter than the real thing but I am not going to worry too much about that.
The bottom line is that this a great gun. I would recommend it to anyone. Get the extra magazine also, you will be glad that you did!"