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Posted: 8/31/2009 10:16:37 AM EDT
| I have a ar with under 400 rds through it. I just ordered a new upper receiver and tool for the nut. The barrel nut was tight as crap to get broke loss on the old upper. I put the new one together and tightened the nut back up. I can get the gas rod back through but its a little crooked. I only need to turn the nut maybe 1/16 in for it to line up perfect but while I try to do this it is twisting the new upper way out of shape. I scared its gonna break. Is this normal should I just go ahead and turn it some more? |
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I hope you greased the threads. Also, did you torque the nut 2 or 3 times before final torque? Usually after torque of 30 lb/ft is applied 2 or 3 times,
and final torque to 30 lb/ft and a notch isn't lined up, go to the next notch that lines up things are gtg. I have seen where some have ground down top of the notch for the gas tube, but I've never had to. Are you using the clamshell type of vise block? |
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Quoted:
Yes I have it in a vise. I just read that 80lbs was the max for the nut. If its already maxed out and I turn it back one slot it might be too lose though. Yes, but do you have it in a Vise Block/Upper receiver block? If you're torquing the upper to the point it's twisting, you don't have it supported enough. Liberally grease the barrel nut and receiver threads. You may have to torque the nut 3 to 5 times; tighten then loosen, tighten then loosen, etc. Torque values...30 ftlbs MINIMUM, most of mine are 55+ although that depends on how much it takes to get the teeth/gas tube hole aligned. If you absolutely can't get them to line up, you can get a needle file and take down the offending tooth. This isn't the most desirable way, but it'll work. |
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