FX Impact .357 tensioning plug size and thread pitch

[JasonW1972]

Hello I'm looking to make a tensioning adaptor to hold tension on my barrel with carbon fiber tube but want to be able to leave it under tension and still remove moderator. I'm seeing if anyone has the size and thread pitch or specs of the tensioning plug in a .357 that holds inner barrel liner. 

 

[drumie]

I think it is a odd size thread. The closest to it that I have found is M13x.5 but that doesn't fit quite right.

 

[JasonW1972]

Thanks drumie!! I called FX USA and asked and they said it's M13x.5. I really hope they are right!! For anyone else looking for this info I called FX USA yesterday and they gave me the info. The tensioning liner lock size and thread for a FX .357 sniper barrel are M13x.5 witch is super fine thread and I have verified the thread pitch with a thread pitch gage from Snap-on and it is .5. Here is a link for a M13x.5 tap https://www.hdchasen.com/metric-tap-m13-x-5. I'm in the process of getting a adaptor made that will keep my barrel tensioned at all times and can remove moderator to put gun in case.