Mine is steel, no name on it, no rounded end but you can push the muzzle end washer in.
Innwr construction: Has a stack of simple, flat washers spaced out with springs, the central hole in the washers must be 8mm or 9mm. (Need to visit mitre 10 to get some with a smaller hole.) I assumed the holes were deliberately made that big for tolerances because JW15 bores were not always concentric with the barrels.
Adding a rubber wipe near the exit did help suppression but I recall accuracy suffered a bit, but it helped me confirm the bullets travel along thecentre of it.
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