I don't think personally there is any point in shooting first strike without rifling. I would try the hammerhead but they don't make a longer one for the shroud of the 9.1. I have two .683 barrels and older one with worn detents and a brand new one. Shot at least 60 rounds through each and I'd say I get at least one break every mag. The accuracy with a smooth bore vs a rifled isn't even close, that's why I wanted the rifled barrel because of its ability to use optics. So for me a smooth bore is out of the question. Perhaps a different platform like the paradigm pro with the sharktooth 16 rifled .686 I believe may be a alternative? I just don't want to drop a 1,000 on the t15 if its the same internals and same issues.