Nice render 2nyka
I've built two mag fed bullpups myself. One off an Ion design and one off a TPX. Both work, but both have downsides since i built them myself. But they are fun, and a company with a decent R&D budget should be able to come up with something pretty decent.
I'm pretty certain the K1 is now just vaporware.
But heres mine:
The bullpup TPX:
And the bullpup ION (top) and a shorter TPX bullpup model (still a work in progress)
The Ion has an adjustable stock, so it's total length with a 16" barrell is 24.5" to 27" It uses Rap4 and Milsig Mags, and probably scarab arms mags too. I made a special mags with a q-loader too. It runs a 12gram or a remote.
I thought about putting a vertical tank at the back, but I wanted the adjustable stock on this design, so that idea went out. The tank out front is a good idea, but the hoses are a bit ungainly and a weak point for breaking. A manifold would be the way to do this.
The BTPX-C is 21" with a 14.5" barrell, the L model is 23" with a 16" barrel" and takes standard tpx mags. Runs 12g, could run remote, just haven't fitted it yet.
In my mind, Spool or automag designs are the best setups for this. The spool model is nice because it can run hoses to a trigger 3-way and be mechanical (like mine) or use a board and be elctro and gain the benefit of automatic and eyes. The automag design is nice because it's a smaller setup.
And Vijil, that is a really cool concept drawing! I really want to try and build that!!!