We are working on something. But not likely be ready until next year.Any possiblities that you fabricate this - one piece magazine tube ( 10 rnds capacity) for Supernova, made out of aluminum to save on weight.
Well it's already October, so two more months, lol, seriously I would consider one, wants to avoid using bbl/mag ext clamp
HhBBB, speaking about bbl clamp, Taccom has some 3D design which I beleive its availiable to whoever is interested. They call it as "stabilizer" instead of a clamp. According to them it will free floating the bbl, so the POI will not change unlike to bbl clamp. its made of plastic cant really remember the exact kind of plastic.