It looks like most of the interest is in bull barrels, so just a strait 1" OD if I'm not mistaken. With that being said, differant lengths will be easy as its just a mater of trimming the end shorter. How long do most run on the DSG and what bore? With the interest I've gotten I'm very close to sending my freak back in to get the threads copied and get the first proto done. What bore size do people want?