It seems to me that we have here a closed bolt gun with 1 or fewer ball detentes, a half back type body, the same magnetic trigger arrangement as found in the Eblades, no front block, and likely an internal ram (or some analogous mechanism, but interna in any case).
In the first pic, you can see that the top of the receiver body is shorter than the bottom. Also, the pin that goes through the bolt comes in from the top. That is consistent with half back designs.
The eye sensor indicates a closed bolt to me- the end of the cover sits a bit forward of the feedneck. This could be an illusion caused by the funky angle, but that's how it looks to me. Open bolt guns have eyes that sit pretty much straight under the feedneck- cause that's where the ball is.