Since pistol caliber rounds don't really need that full 16" BBL to pick up speed (10" rifled section is probably plenty long enough), how about a ported barrel option for the TS carbines?
The first 4" from the muzzle (ahead of the stock, exposed) can be counter-bored and have holes drilled in the sides and top, it will serve as a long muzzle-break/flash-intensifier.
Will be flashy!
will be loud!
will be cool!
Cool pistols like Glock24 have ported versions, why not the HP carbines?