I bought the Magpul AR wrench and the Magpul vise block, I've tried others and just gave them away after using the Magpul tools. Getting the barrel indexed and torqued isn't the hard part it's like said before, when you have to ream the holes if you are using a F style front sight base, you have to align the sight with the barrel and center everything, or you may not have enough rear windage adjustment to be in spec. If you are using a after market forearm and a different buis or a scope, than all you have to do is come close centering the gas block.
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