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G&P M4/M16 FF outer barrel

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The barrel should be attached to the reciever via delta ring, remove the delta ring, tighten up the barrel nut (its the larger part of the barrel that is connected to your upper reciever), screw down everything, and put the delta ring back on, and you should be good to go.


The inner barrel holding the outer barrel is kind of...odd if you think about it, a brass (stock) barrel will bend with all the weight of being pulled by a heavy one piece barrel should the inner barrel be acted as the retaining unit for the outer barrel. So its completely the opposite, outer barrel holds inner still.

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