FX Impact shrouds...any moderation capabilities?

The shroud DOES help a lot on muting + the moderator. If you see FX moderator is just an empty tube. inside the shroud there is a sort of diffuser that send the air to the shroud and the moderator. Easy test to check that, remove the shroud and attach a moderator 1/2-20 thread direct to the barrel (you can) then you will hear the sound. 
 
The shroud DOES help a lot on muting + the moderator. If you see FX moderator is just an empty tube. inside the shroud there is a sort of diffuser that send the air to the shroud and the moderator. Easy test to check that, remove the shroud and attach a moderator 1/2-20 thread direct to the barrel (you can) then you will hear the sound.

Ahhh...so the stripper is hidden up inside the end of the shroud. I didn't compare the length to notice that.

I noticed the FX cans were empty but can be opened. Seems like there is opportunity to add some strippers and felt in there to improve their performance.