Silent Thunder Ordnance Shroud Damper Installation Help FX Impact MkII .25

I'm wondering if anyone has any experience installing the Silent Thunder Ordnance Shroud Damper on a .25 or .30 FX Impact MkII. I have the 700 mm barrel and I just can't get the shroud to unscrew in order to place the damper even after using a lot of heat. In truth, I'm not sure I'm applying heat in the right place, but I'm assuming the threads are at the base of the tapered cone shaped area as shown from the STO website demonstrating placement of the damper on the FX Crown: https://www.silentthunderordnance.com/air/shroud-damper

That may be completely wrong on the Impact, but I have not been able to find any information about this, and any help would be greatly appreciated. 

I'm already using the Sarissa modifier from STO and wanted to go for max noise suppression if possible. I appreciate the science behind the technology being developed by STO- just want to get the full effect. Thanks!
 
A friend of mine has the first gen Crown, it has the shroud that extends to quiet down the shot fired. I had a pretty easy time extending the shroud, and then turning the shroud counter-clockwise to remove it from the barrel. I don't know how am Impact shroud is mounted, but I would be very reluctant to apply heat!! Before you go any further, try calling FX on Monday, or maybe someone will chime in here.