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Posted: 2/2/2006 3:31:42 AM EDT
I have an upper that I bought a YHM mid tube for. Is there a way to lock this tube onto the upper? It's a Oly 40 cal and there isn't a gas tube to keep the barrel nut from spinning.
Link Posted: 2/2/2006 3:34:20 AM EDT
What keeps the barrel nut from spinning now, with the original setup?
Link Posted: 2/2/2006 3:40:13 AM EDT
[Last Edit: 2/2/2006 3:41:58 AM EDT by brushdog]
A lot of torque! With the tube, I might add a forward pistol grip and I'm not sure if the extra pressure on it will start twisting it off.


Originally Posted By Punani:
What keeps the barrel nut from spinning now, with the original setup?



Thinking about your question for a minute, I guess I should really ask if it's necessary to try and lock it.
Link Posted: 2/2/2006 4:46:32 AM EDT
You might be able to put a gas tube in it anyway. That help stop the nut from spinning if it came loose.
Link Posted: 2/2/2006 5:58:05 AM EDT

Originally Posted By brushdog:
A lot of torque! With the tube, I might add a forward pistol grip and I'm not sure if the extra pressure on it will start twisting it off.


Originally Posted By Punani:
What keeps the barrel nut from spinning now, with the original setup?



Thinking about your question for a minute, I guess I should really ask if it's necessary to try and lock it.



I don't think it's your gas-tube that keeps the barrel nut from spinning, if that was the case, all tubes would wobble. Mine doesn't, so I guess if torqued correctly....should be OK
Link Posted: 2/2/2006 8:40:57 AM EDT
[Last Edit: 2/2/2006 11:13:43 AM EDT by Trey-W]
blue loctite.

NM, I thought you were talking about the tube itself, not the barrel nut.
Link Posted: 2/2/2006 9:04:00 AM EDT
the gas tube is what keeps the barrel nut from spinning and the lock ring keeps the tube itself from spinning.


i would also suggest modifying a gas tube to index the bbl. nut if you're worried about it.
Link Posted: 2/2/2006 9:05:08 AM EDT
The great thing is, with a pistol upper, you don't have to worry about aligning the holes... If "really tight" puts you inbetween gas tube holes, it doesn't matter.

You might also consider fab-ing up your own locking mechanism that puts bolts or similar through the closest gas tube hole on each side of the receiver.
Link Posted: 2/2/2006 9:40:07 AM EDT
This is a non-issue. Tighten it up, and don't worry about it. Had a YHM tube on an Oly .45 upper for a long time, with no issues of it coming loose. The gas tube in a properly assembled upper does nothing to hold the barrel nut in place.
Link Posted: 2/2/2006 10:55:09 AM EDT

Originally Posted By mattimeo:
This is a non-issue. Tighten it up, and don't worry about it. Had a YHM tube on an Oly .45 upper for a long time, with no issues of it coming loose. The gas tube in a properly assembled upper does nothing to hold the barrel nut in place.




actually the gas tube does keep the barrel nut from backing all the way out or to the point where it would cause the bbl. to be loose.

and when excessive torqueing on the tube with a vfg there is a chance of it coming loose.
Link Posted: 2/2/2006 11:18:04 AM EDT
[Last Edit: 2/2/2006 11:19:23 AM EDT by mattimeo]

Originally Posted By eklikwhoa:

Originally Posted By mattimeo:
This is a non-issue. Tighten it up, and don't worry about it. Had a YHM tube on an Oly .45 upper for a long time, with no issues of it coming loose. The gas tube in a properly assembled upper does nothing to hold the barrel nut in place.




actually the gas tube does keep the barrel nut from backing all the way out or to the point where it would cause the bbl. to be loose.

and when excessive torqueing on the tube with a vfg there is a chance of it coming loose.



If the barrel nut is so loose that the gas tube is keeping it from backing off, then you're going to have carrier key alignment issues.

Re-read what I posted. In a properly assembled upper the gas tube does not hold the barrel nut in place. If you torque the barrel nut properly, the gas tube does nothing to hold it in place. If it did, then there would be no torque spec. You could simply stop tightening when it got hand snug.

Beyond that, I have yet to see anyone who wasn't absuing a gun break a barrel nut loose by torquing on a vertical foregrip. A free-float from the barrel nut? Yes. A barrel nut from a receiver? No.
Link Posted: 2/2/2006 11:31:19 AM EDT
gas tube does not hold it i agree but it does keep it there.
Link Posted: 2/2/2006 11:41:09 AM EDT

Originally Posted By eklikwhoa:
gas tube does not hold it i agree but it does keep it there.



Negative. Continue to believe this, if you must.

While you're at it, console the hundreds of AR-10 users whose barrel nuts inexplicably loosen up and fall off because the gas tube doesn't pass through a notch to 'hold it in place.'
Link Posted: 2/2/2006 11:49:19 AM EDT
not saying that it holds it in place.


im saying that if the nut was forced to back out the gas tube will keep it from doing so.
Link Posted: 2/3/2006 11:47:24 PM EDT
[Last Edit: 2/3/2006 11:48:27 PM EDT by AR15barrels]
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