Gunsmithing Barrel Nut Torque

[Rock Head]

I'm building my first AR and when I torque my nut to 30 ft/lbs the gas tube does not line up. If I back it off the nut seems to loose. I have gone up to 45 ft/lbs with a ways to go before I clear the barrel nut and align the gas tube. How high can I go?

Thanks in advance for your advice

 

[338RUM runner]

Re: Barrel Nut Torque

Till it lines up. Run it close 3 times with some nolock and then go till it lines up.

 

[insight3b]

Re: Barrel Nut Torque

I was in a similar situation and what I did is I ground off the tooth of the bbl nut that was getting in the way.

 

[KTDLS7]

Re: Barrel Nut Torque

This looks familiar . . .

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=3734882

 

[simplerider]

Re: Barrel Nut Torque

Is this barrel nut new or being reused from a previous build? If it is new, torque it to the recommended 30 lbs, unscrew and repeat 3 times and then tighten to the next hole.

If it is an old reused nut, be careful. If you feel it wont continue tightening to the next hole, the threads may be at there limit to stretch and you may cause damage. As above when you tighten the initial 3 times you are effectively stretching and "setting" the threads. If this has been done several times already it just wont give anymore and may strip the threads. Either the receiver threads or the nut threads.

 

[insight3b]

Re: Barrel Nut Torque

Also,
When using an extension such as a barrel nut wrench even though you set your torque wrench to 30lbs you aren't torquing 30lbs...

http://www.belknaptools.com/support-library/extensions-calculator/