FX Impact Barrel

Hey guys, I know a few people in the past have had this issue and I can't recall the solution. But I have a customer who removed his factory extendable shroud from the barrel and it looks as though the smooth twist liner is sticking out of the barrel. I recall someone saying you had to apply loctite somewhere and put it back into the factory shroud. Wait for it to dry then unscrew and it will no longer show. Does anyone know where to apply the loctite?

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Ok problem solved. I've heard of this come up a few times but now I can see what's happening. A customer sent me a few pictures and I'll list them below to document for future people.

I didn't know there are two pieces to the barrel. 
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If you take off your shroud and you see the smooth twist part, put some red loctite on the threads and screw it back into the shroud. Leave it over night before attempting to remove the shroud again.
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