I assembled this a few months ago. When I shoot it sounds like a tuning fork. I suspected it was the Vortex muzzle device. I bought this Vortex in 1991-92. I had it on my first Colt. Can't remember why I took it off. I found it in one of my parts boxes. I installed it on this carbine because I wanted something different. The rifle resonates similar to a tuning fork when I shoot it. To test my theory, I shot the carbine with the Vortex removed. It sounded like my other ARs. Has anyone else had this happen to them or something similar?
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