AR upper

trda

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Location
Alberta
I have bought an Ar complete upper from a fellow CGN and it came disassembled. It is my understanding that you need a special wrench for tightening the barrel nut and I was woundering where I could get one? I was also woundering about a torque spec on the nut and what about head spacing. Is this going to need to be set or are they set from factory?:confused: Thank you
 
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