First thing you're probably saying is "WTH?"
This was the setup I used to get the nut torqued to spec (40ft/lbs) having use of only one hand. There might be other folks out there who are in the same boat and there isn't always someone around to help lend a hand, literally.
Explanations:
Standing/holding the stock and receiver with my feet - With the receiver in the vise I found that as I torqued the nut the buffer tube would twist and leave the stock sitting at a crooked angle. I'm not able to hold the tube from twisting while applying torque to the nut with only one hand. This was what I came up with.
Foam pad under receiver - should be obvious that it is to cushion the receiver.
Standing on my workbench - I had to raise the receiver high enough off the ground that I could position the armorer wrench so the head wouldn't get stopped on the ground when I torqued it. So, I hopped up on my bench and let the wrench head overhang.
Tape on the buffer tube - precaution to cover the tube so I didn't mar the threads if the wrench slipped
Finally all this positioning allowed me to get the torque wrench in the strongest position for me to pull up and get to torque spec. I needed to secure the nut.
Subsequently, the castle nut was staked with a spring loaded punch. You'll need multiple strikes and do that until you're satisfied with the stake. I recommend a few strikes straight down to form the dimple to keep the punch from skittering off. Then you can strike at an angle for the stake.
Hope this helps somebody.





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