unscrew the base end and make sure there isnt a "spare" thread protector cap in there...mine had one so I ended up with two...they left factory with it stored in there.
pretty sure the manders are alloy all the same. the thread recently with 3 .22lr and 2 centrefires has a no name suppresser that looks just like one.
you could try giving internals a good clean out with hot water etc to get rid of built up powder etc...it does make a difference.
funny that now I just use subsonic power point in my JW without suppressor as its very quiet as it is....
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