The Angry Gun Silencer doesn't fit, it wobbles a bit causing my FPS to drop to 130. I've tried screwing it tighter but no joy, still wobbles from the base. I think the flash hider on my ASG MP9 is different to the KWA.
I'm thinking of selling it now and getting a KWA MP9, and to reduce the FPS with the Angry Gun Silencer I'll use weak gas like Abbey 144a.