The idea was the Arcturus karambit series which have this kind of suppressor.
I'm not sure how the original is designed regarding it's length, holes etc. but i wanted the look to be simmilar so that's why it has a 25 mm “countersink” (as you can see on the photo) because my outer barrel is longer than the handguard.
The suppressor is just a dummy, it doesn't suppress anything.
The author marked this model as their own original creation.