I put a gas piston system in one of mine and the replaced gas block didn't have a swivel. So, I had a 4" bolt on accessory rail on the bottem hand guard. I found a swivel at a local gun store that mounts to that tac rail. It put the front swivel about an inch from the end of the hand guard. hasn't pulled the guard off so it works for me.
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Army.USMC.Airforce (Res)
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