This is an HK weapon? Nothing on it looks like it's interchangeable with anything but brand spanking new HK parts. No light rail, new, different magazines, no way to mount anything but that fancy new HK dot scope. Looks like HK has gotten themselves a smashing new government contract to design stuff so that no one else can contribute any add-ons.
Doesn't look like there's a rate selector switch on this one, but surely it's standard on the real deal.
All that's going to make the first civilian versions very expensive. That sucks.
Big deal. I had one of those when I was 5. It had a nice red light and made loud noises when fired!