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I forgot...the other gentleman suggested vise blocks, make sure the blocks include a plug that replaces the bolt carrier, to keep from making the casting oval.
Indy

I was not sure what you planned to do with the wrench you asked about. Like the other gentlemen said, if you want too tighten the castle nut on a collapsable(sp) butt stock, then you need the three...

I just had in a customer's AR and he had installed the mag release with a couple extra turns. The magazine could not be seated all the way in the mag well. The nose of the cartridges were push into...

I have built a lot of ARs and never used a wrench on a buffer tube. If you use a wrench, I wouldn't go above approximately 25lbs. If you really torque the tube you could crack the casting.
Indy