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Posted: 10/21/2014 9:08:51 PM EDT
[#1]
Not good, most like the barrel extension and barrel are no longer good friends. To the smith or get a barrel with extension and replace the it yourself.
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Posted: 10/21/2014 9:37:16 PM EDT
[#2]
Guessing its not something I can send it back to bushmaster for a free fix? I don't know if I'd even want to send it back to them anyway now that Bushmaster isnt really Bushmaster. What could cause this? I never abused the rifle, maybe got the barrel pretty hot some times having fun but nothing that I would expect something like this.
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Posted: 10/21/2014 9:43:50 PM EDT
[#3]
Yes, your barrel nut is loose.
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Posted: 10/21/2014 9:50:41 PM EDT
[#4]
Quote HistoryQuoted:
Yes, your barrel nut is loose. This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience, unless you are using a barrel mounted front sight. |
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Posted: 10/21/2014 9:54:15 PM EDT
[#5]
Quote HistoryQuoted:
This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. Quote HistoryQuoted:
Quoted:
Yes, your barrel nut is loose. This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. But he shouldn't shoot it till he gets it fixed. |
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Posted: 10/21/2014 10:06:12 PM EDT
[#6]
Quote HistoryQuoted:
This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. Quote HistoryQuoted:
Quoted:
Yes, your barrel nut is loose. This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. Good to know, thanks for the response. My buddy has my barrel wrench, Im going to get it back tomorrow and hope that it just needs to be tightened. Indeed it was just a few MOA off but it was enough to drive me crazy since I had always been dead on with it. |
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Posted: 10/21/2014 11:00:55 PM EDT
[#7]
Make sure you grease the threads with moly grease and do the three time torque. Make damn sure you line the notch for the gas tube up every well.
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Posted: 10/22/2014 12:31:30 AM EDT
[#8]
Quote HistoryQuoted:
But he shouldn't shoot it till he gets it fixed. Quote HistoryQuoted:
Quoted:
Quoted:
Yes, your barrel nut is loose. This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. But he shouldn't shoot it till he gets it fixed. There is no safety issue and it is fine to shoot like that. Only issue is it might prematurely wear the bolt/extension lug surfaces if it is misaligned during lock and unlock. However, it still absolutely locks before firing and headspace is unaffected. |
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Posted: 10/22/2014 1:01:16 AM EDT
[#9]
There was a post on here about a Ranger firing his M-4 with a loose nut excessively, It stripped the threads off the upper receiver.
It's not good for the gun. |
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Posted: 10/22/2014 6:08:29 AM EDT
[#10]
Just take the gas tube off and properly torque the barrel nut down, no foul no harm.
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Posted: 10/22/2014 7:39:28 AM EDT
[#11]
Quote HistoryQuoted:
Just take the gas tube off and properly torque the barrel nut down, no foul no harm. Thats the plan for today after work. |
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Posted: 10/22/2014 12:08:26 PM EDT
[#12]
I would go by your local auto parts store and get a tube of moly fortified wheel bearing grease and do it right. The TM specifies this for a reason due to the Torque Values being based on the nut and threads being greased. Do the three times torque to get a good thread mesh too.
Half-assing this step can cause what happened to you already or cold weld the nut to the threads making future removal near impossible. |
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Posted: 10/22/2014 1:08:43 PM EDT
[#13]
That's a lot of play. If the barrel+extension is not indexed properly on the upper, you might have some extreme windage adjustments to do once everything is said and done.
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Posted: 10/22/2014 6:01:39 PM EDT
[#14]
Fix it ASAP.
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Posted: 10/22/2014 8:17:06 PM EDT
[#15]
Quote HistoryQuoted:
There is no safety issue and it is fine to shoot like that. Only issue is it might prematurely wear the bolt/extension lug surfaces if it is misaligned during lock and unlock. However, it still absolutely locks before firing and headspace is unaffected. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Yes, your barrel nut is loose. This. And it is not uncommon. I have had several come loose over time, especially when they torque up right at the minimum spec around 30-35lbs, and using an aluminum nut like the YHM rails came with. It wont cause extreme accuracy issues, nothing more than a few MOA in my experience. But he shouldn't shoot it till he gets it fixed. There is no safety issue and it is fine to shoot like that. Only issue is it might prematurely wear the bolt/extension lug surfaces if it is misaligned during lock and unlock. However, it still absolutely locks before firing and headspace is unaffected. Falarak has been around for awhile and even though he's from Texas he still knows what he is talking about. Headspace and bolt lock up is still the same so it is safe. But I wonder what else might be going on. It's not that hard to remove the handguard (depending on the guard) and then use a roll pinpunch to drive out the front sight block gas tube pin and remove the gas tube. Then you can remove the barrel nut and examine it and the receiver threads. It is not common for the barrel nut to loosen enough to allow much play; the gas tube prevents much rotation usually, so look at your parts and just be thorough and go item by item. There are plenty of videos and maybe start with the Brownells ones on attaching a barrel to see how to do it from the start. PS JK, Fal. |
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Posted: 10/22/2014 10:15:17 PM EDT
[#16]
BTW, I have been around a while too.
I never said it was a safety issue either. This is why I said he should fix it before firing it again. Shooting with a loose barrel may not be dangerous, but is sure is stupid and totally unnecessary. http://www.ar15.com/forums/t_1_5/892478_.html 
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