I was thinking of running a KWA KMP9, I ended getting a Tm 1911, but my friend purchased the KMP9, and it's suprisingly light! The mags feal heavier then the SMG it self. The rate of fire and accuracy is pretty outsanding, especially witht he short barrel it has. You'd only really need 2 mags if you were using it as your sidearm, also note that the mag release is super tough; making it optimal to crawl around with, as you won't loose the mag.