Measurements holes??? - Aero Precision AR-15 BAR Barrel Nut and Shims

You won't find a multi-tool wrench that will tighten this bad boy! Bought many high brands will all the high tech and I'd figure it was the wrenches themselves but on the contrary, it's the barrel nut itself. Great for an alternative barrel nut, but I couldn't say much about anything else. Seems like Aero might as well sell a wrench whose only sole purpose is for this forsaken barrel nut. My Ar-15 has been collecting dust for a while. I absolutely don't recommend this anymore, for all I care I might just run ducktape/super glue/weld the barrel to the upper.