Wait you said flash hider, I'm not very clear about silencers that attach onto a flash hider but I'm pretty sure it is suppose to click, screw or snap on (something along the line of those), now did the flash hider come with the silencer? If not that may be your problem.
When you put the silencer on the flash hider will it for sure no move or wobble around?
I know my silecner unscrews itself if it is not locked into place and screwed fully on, to the point of not being about to take it off
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