According to their web site they still are making them. With the exception of screw in chokes this is what I ended up with after cutting down the old set of tubes I bought. Mine are quite handy and make it possible to shoot guns that I would never get to shoot otherwise. Worth a call to see if they can make a set for 2 1/2" chambers.
I do not buy the hype that a 28 or .410 wad seals a 12 bore barrel. In fact I doubt that the 20 does it well. I guess that a 20 wad might flex enough to seal the bore but the first leakage around the edge would allow the gas to bypass the wad and break any seal. It seems like a better concept to make a set of tubes that allows the powder to be burned within the tube rather than trusting a wad to seal a bore it was never designed to seal.
