I had one of those kits and never had the courage to fire it, got my money back out and was happy with that
The one I had came with a nylon mainspring housing with slots for the shoulder board hardware, which is clamped on with a large screw and not very confidence-inspiring for being robust. Not really "detachable" like a typical shoulder stock.
The 16" barrel is... unwieldy. I put in a Systema Colt and it pointed down about 10 degrees and off to one side. Even without that offset, it was still goofy awkward. Not at all like a Mauser C96, Luger, High Power, etc with a factory stock.
I think it’s beautiful and innovative. If you think its designer should be shot, take a little look back at the things YOU’VE come up with and apply the same standard to yourself. Either way, you lose.
If you're talking about the OP shoulder board kit, there isn't much innovation there (or beauty, really).
The recommendations against the designer(s) are pretty silly of course but that's just MDS-talk.
No one had mentioned the AR stock thingy (3011) until just now.