For those interested:
Initial machining looks good. The guys I use are top-notch, and care about their work, which REALLY makes a huge difference.
I haven't had much time to put into R&D however, my top priority has been the WETTI AWSS trigger group for SCAR and M4/4168.
I've been trying to find ways of making the kit seal better than it currently is - I've had some leaking problems, which just won't do. The idea here is to increase gas capacity, so it's got to be dead-simple to install without leaking. And right now, that isn't the case.
I'm also delayed on finding someone to do the plastic/nylon molds for the base-plate. Yes, people can use the standard-capacity base-plate, but it's not authentic to the look of the extended mag - and is part of what I think makes the mags look dead-sexy.
That's about it, really. I've been trying to keep people updated via
http://6mm-mag.com/ - but again - priority is with the WETTI AWSS trigger group.