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If I do it how you say to will it shoot loose? It just dosen't seem like it would be enough torque.
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It won't shoot loose. The barrel nut can't turn with the gas tube in place. I've done over 130 AR barrel jobs, and only had a barrel loosen up once - and that was on an orignal factory Colt 6500 A2. After 5 years and more than 10,000 rounds, I noticed the barrel wobbled in the upper a little. Of course I kept shooting it for a few more weeks. I fixed it by removing gas tube and turning the barrel nut until the next notch lined up. No barrel I've ever installed has ever "shot loose".
It just dosen't seem like it would be enough torque.
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Worrying over barrel nut torque is due to a complete lack of understanding of just how the Stoner gas system works. Why do you need to apply a whole lot of torque to an assembly that is under no firing stress whatsoever? Besides being a guide for the bolt carrier to move in, the upper receiver basically is just a glorified rear sight mount. Why do you need to torque your rear sight mount down to 30+ ft.lbs.?
It's funny, because the thin-walled, flimsy buffer tube takes a whole lot more firing stress than the heavy, forged upper receiver when the buffer slams into the back end, but no one torques it down to 30-80 ft.lbs. Everybody just takes a Crescent wrench and tightens it by hand - but not too tight because you don't want to strip out the fine threads.
Also what do you mean when you say to "spin the barrel nut on by hand", do you mean to just use your hands?
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Yup, your hand. You know that thing you've been choking the chicken with all these years?
Well, now your hand is your second favorite tool and it's time to use it.
I just want to get it done right. I'm sick of takeing the FSB off to replace them dam Barrel nuts!
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If you did it my way then you would've only done it once and never had to remove a front sight base. I used a have a long write up in the archives that told how to mount an AR barrel (and line up the front sight!), but it looks like it dropped off the server due to old age. Guess I'll have to post it again.
Quoted:
Homo_Erectus is BACK!
Where you been man? We missed ya.
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Geez - this place has fallen apart without me.