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turn it the other way...it's negative threading on one bit and positive threading on the other. Also, there's often a tiny set screw that locks those parts in place...you have to back the screw off before taking those sections off.
but...taking off the flash hider has nothing to do with removing the upper receiver...
Maybe you mean to take off the front sight, to then take off the handguard...but that's not the upper receiver.
Best of luck...it seems like you're going to need it.
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