I have a factory barrel for my Beretta 92 and my Glock 17. All threaded 1/2x28. The threading is not that deep. Although the suppressor seats fine it does not engage the o-ring seal so it is not as quiet as it could be. I have a Gemtech Multimount I run on them. The Glock seems a bit quieter than the Beretta. I also run my Multimount on a S&W M&P 9 and it is the quietest setup I have for 9mm.
I have a Octane 45 HD in the pipeline right now. Cant wait to try that out.
Dave
Thanks for the info Dave. I was going to have my Factory barrel threaded,but decided I'm just going to get one from Tornado Tech or Gemtech.