How to open this??

I used an Allen Key. By putting the short end in you can get closer to the edges on the inside. Then just push on the key and work your way around. If I remember right there is three maybe four plastic bumps on the cap that holds it into a groove inside the main body. Do not try to take the metal peace off. It is press fitted into place and you'll end up destroying the hole thing.
 
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peterdulux said:
Tried using an A/C pipe duct foam (or whatever its name is 😃) It looked like a real rifle suppressor but as I took some shots it started coming backwards.Then I applied tape on it. All of a sudden!!! The sound was amazingly reduced.After few empty fire something came out of the silencers front hole.And That something was the sound suppressing material.After few more fires all pieces of it came out.No worries cause it was already damaged.