A Super DISC is really an Original DISC, pre Extreme. We have upgraded ours from the Original DISC bolt and breech plug to a Extreme bolt and a Lehigh/Knight NFPJ breech plug... But the big thing is the Super DISC, depending on the serial number comes with a 1-20 twist bore... I found one here in a local store - brand new never been shot and sent it to Tom - but I think he is using one of his other Super DISC's for the Ohio hunt.