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Posted: 1/12/2013 10:19:50 PM EDT
| I have heard that the torque amount can have an effect on the accuracy of a AR barrel any takers on this question thanks |
Read what Desert_AIP linked to. Carefully. A properly assembled upper will be more accurate than a hafl-assed, thrown together unit, and torque has a part to play in the "properly assembled" part. So does an in-spec upper, and using the right tools and processes. Instead of rehashing a very old discussion, I'll simply say that if you follow the TM's procedures, and take simple care with what you're doing, using the right tools and materials, you'll wind up with a quality upper that will most likely (assuming you use good parts) be much more accurate than you are. If you go cheap, skip the grease, have your brother in law sit on the upper while you use a pipe wrench to tighten the barrel nut, etc., well, you get the picture, right? 
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Quoted:
I have heard that the torque amount can have an effect on the accuracy of a AR barrel any takers on this question thanks The only place I've seen this mentioned is in the Brownells AR Build video (free at Brownells) The smith eludes to something about staying low in the torque is a good thing. |
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Quoted:
Torque values for the barrel nut are so broad based, ( 30-80 ft.lbs.) because if a recess for the gas tube is not achieved any single number is irrelevant. ...except it has to be within those limits to ensure the barrel is secure in the upper without excessively stressing the upper. So two numbers are relevant: at least 30, but not more than 80. In practice, if you get a notch to line up exactl at 30 ft-lb, you should be suspicious, and if you're near the top end of the range, you should probably back off and retorque the nut, because you'll probably line up a notch at a much lower torque. I agree 100% that the specific torque for any individual installation, as long as it's within those limits, is indeed irrelevant. |
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