Early FX Royale 400 moderator

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You need to apply heat (first Pick) while applying heat grab the tip of the shroud with glove and rotate and pull, i think they used red locktite, once the tube comes off the base use 2.5 mm hex key to remove base, good luck.
 
Yep, remove the barrel and apply heat where indicated above. The moderator tube does not screw onto the base, but is held with epoxy. It takes a lot of heat, but it will release. The end cap is threaded and should unscrew. I scratched the tube on mine getting it off in spite of the heat, and had to repaint it. All things considered, there is really no need to remove it, unless you are planning to replace it with another suppressor.
 
Here's a little more info to answer your question.
I have two early Royale .177 cal. barrels that I use for Field Target matches. I decided to get 'into' one to swap out the factory moderator with a Weihrauch moderator. The FX parts drawings don't really show much detail on the muzzle end so 'inquiring minds need to know'. I used a heat gun to break down the thread-lok at all the connections.
The shroud on my moderator IS threaded. So it appears FX made at least two versions of this connection. What really surprised me was the extra piece of 'barrel' that covers the area where they applied the rifling on the end of the barrel. You can kinda see the impressions on the surface. The diameter of the end of the barrel is about the same diameter as the pellet liners found in all the STX barrels today.
I put it back together with the Weihrauch and did some testing at 55 yds. The setup is good but the original factory setup is just a little tighter at this distance. I think it's due to the aluminum air stripper that helps reduce turbulence when the pellet exits the barrel.
So now we know what's inside an early Royale barrel and you won't have to do this your barrel. 😁

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