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5spd did you have trouble with the pins on your ar wrench fitting in the holes of the barrel nut? The pins on my wrench was to big to fit the holes of the mmr barrel nut. I had to file the diameter of all 3 pins down for them to fit in the barrel nut holes. But I got it all tore down and waiting for the parts to arrive this Friday to put back together. I will also lap the receiver.

 Thanks again. Dan

Edit to say, mine did not have that silver ring as pictured.