Dont get an aftermarket barrel for suppressor use. Use a FACTORY HK, SIG, or Glock FACTORY Threaded Barrel with a Suppressor and youll have less headaches and reliability issues, especially after the host gets dirty and warm.
What sort of reliability issues have you encountered? Anything in particular one should be wary about? Anything to check? I ask because I have been running three new threaded storm lake barrels for the last two months with pretty good results... in fact, on a M&P9, I've experienced better accuracy compared to the factory threaded barrel I have. On the few barrel's I have, dimensions and fitment seemed to be spot on.