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Originally Posted by mcguyver
That's the cylinder. Pull your upper completely out of the gun and inspect it thoroughly. Is this gun stock, or has the upper been upgraded. That cylinder should move enough to catch the sector gear.
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According to 27Maverick, it is stock, used once. I have the upper out and I am looking over all of it, there are scratches on the cylinder, so that could be the cause of the grinding perhaps, it does not move however, the only thing that moves in there is the black latch that moves back and forth freely. From what I can see, the upper mechbox looks fine.