I mean it's pretty easy to hide the flash. Said flash is just burning powder after it leaves the barrel. So if you have an expansion chamber after the barrel it

I mean it's pretty easy to hide the flash. Said flash is just burning powder after it leaves the barrel. So if you have an expansion chamber after the barrel it will be contained. Silencers do this secondarily with the first order effect of reducing the noise. An empty silencer (no baffles) will still hide the majority if not all the flash.