My Remmington Express had an " integrated " moderator but is was just a solid lump of plastic.
As you can imagine it did nowt.
Billy buzz saw removed it ,a toolmaker friend profiled the end ,ebay provided an adaptor.
Then Blade off here made a fat silencer all good news .
Possibly your " silencer " is the same ?.
Or maybe the rifle needs a tweak to quieten down.
Spring guides ,top hat decent spring ( Welsh willy) ,plenty of tuners on here if you're not a back street mechanic.
If you are have a strip down see wots occurring in there good luck.