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Posted: 7/20/2022 2:09:16 PM EDT
[#1]
Not quite understanding the 5 o'clock thing.
Every delta ring set up I've seen uses a barrel nut with gas tube clearance cuts all the way around the OD. And the delta ring can spin around the nut, so it's cut-out can be positioned where it needs to be. 
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Posted: 7/20/2022 2:16:27 PM EDT
[#2]
Worst case, your nut will only be off by 9°, and that can be fudged a little by how much you torque you put on the the nut when installing, as there is quite a range between minimum, and maximum.
(don't forget to grease the threads) Or use those sims to fine tune. Then just turn the delta ring to where it needs to go. |
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Posted: 7/20/2022 2:49:10 PM EDT
[#3]
Yes OP, the linked shim kit will enable you to time the alignment of your standard/USGI style barrel nut.
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Posted: 7/20/2022 3:02:14 PM EDT
[#4]
Use a lapping kit first, you may not need shims, and you can get the surface trued up.
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Posted: 7/20/2022 3:20:51 PM EDT
[#5]
delete
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Posted: 7/20/2022 6:39:50 PM EDT
[#6]
Quoted: When torqued, the gas tube opening was at about the 5 o'clock position. Obviously, I need to shim the barrel nut. No, not obvisously. How many foot-pounds did you torque the barrel nut to? Did the gap between the teeth in the barrel nut align with the gas tube channel in the upper receiver? You know that the delta-ring spins to align it after you've torqued the barrel nut, right? .... |
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Posted: 7/20/2022 7:45:17 PM EDT
[#7]
Quote HistoryCurious why you said that one revolution is .062"? Not something you saw on a web site somewhere, was it? Try the math with the threading shown on the drawing. |
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Posted: 7/20/2022 7:57:26 PM EDT
[#8]
Quote HistoryQuoted: Curious why you said that one revolution is .062"? Not something you saw on a web site somewhere, was it? Try the math with the threading shown on the drawing. .0555" |
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Posted: 7/20/2022 7:58:51 PM EDT
[#9]
Quote HistoryQuoted: You know that the delta-ring spins to align it after you've torqued the barrel nut, right? Evidently not, with the 5 o'clock statement. |
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Posted: 7/20/2022 8:01:34 PM EDT
[#10]
Quote HistoryQuoted: Based on 16 Tooth per Inch thread on the receiver and barrel nut.. I know how to do it. Try it with the drawing thread pitch. Hint. The upper and barrel nut are not the same threads per inch as the buffer tube number that may have been used somewhere. The drawing does not show 16 for the upper and nut. |
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Posted: 7/20/2022 8:25:34 PM EDT
[#11]
Quote HistoryQuoted: I know how to do it. Try it with the drawing thread pitch. Hint. The upper and barrel nut are not the same threads per inch as the buffer tube number that may have been used somewhere. The drawing does not show 16 for the upper and nut. Its 18 TPI, I just wrote it down wrong. Thanks for pointing this out. It still works out to about .00275" per tooth however. So the same shims still would work. |
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Posted: 7/20/2022 9:25:51 PM EDT
[#12]
Lube and season the nut by tightening and loosening, and you should be able to get alignment within the torque range without shims. It should not be an issue with a mil spec nut and in-spec upper, but make sure the rear face of the nut isn't contacting the receiver.
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Posted: 7/20/2022 9:49:07 PM EDT
[#13]
Quote HistoryQuoted: You know that the delta-ring spins to align it after you've torqued the barrel nut, right? Please say yes. |
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Posted: 7/20/2022 10:17:05 PM EDT
[#14]
The “one opening at 5:00” thing is hanging me up. The Delta ring, slip ring, and snap spring ALL rotate to allow passage for the gas tube. Line up any of the barrel nut notches with the gas tube hole in the upper, and then align the rest to match.
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Posted: 7/23/2022 3:09:16 AM EDT
[#15]
Quoted: When torqued, the gas tube opening was at about the 5 o'clock position. Obviously, I need to shim the barrel nut. Quoted: No, not obvisously. How many foot-pounds did you torque the barrel nut to? Did the gap between the teeth in the barrel nut align with the gas tube channel in the upper receiver? You know that the delta-ring spins to align it after you've torqued the barrel nut, right? OP, the barrel nut torque spec is a wide, generous range of 30-80 ft lbs. This is to ensure you can readily line up a gap in the teeth of the barrel nut. What Molon is talking about which I 100% agree with and suspect is the actual issue you THINK you have is the hole in the delta ring/weld spring, which can simply be rotated into position AFTER the barrel nut is torqued and aligned properly. As long as your barrel nut is torqued somewhere in that 30-80 ft lb range, and the hole in the receiver is lined with one of the gaps in the teeth of the barrel nut, you are golden. Grab a pick/screwdriver/punch or whatever, and by hand align the hole in the delta ring and the gap in the weld spring with the barrel nut.  How to Install an AR-15 Barrel Presented by Larry Potterfield of MidwayUSA |
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Posted: 7/23/2022 12:01:30 PM EDT
[#16]
Yup, first reply, and several after it...
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