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To tighten, or not to tighten...


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#1 OFFLINE   NewARBuilder87

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Posted Jun. 09 2018 - 04:20 PM

On my 2nd build now, I'm at the point of installing the handguard, as I'm trying to tune it to where the rail lines up, I get ever-so-close, but hit a wall. Now if I loosen it to where it lines up, it'll be under-torqued, but don't know if I should push it tighter so it'll line up. So I'm at an impass at what to do, open to suggestions. I'll attach a pic of how close it is at the wall.15b8e5ae07e5fbc66f7f9a618651dfcd.jpg

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#2 ONLINE   towtruck

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Posted Jun. 09 2018 - 04:23 PM

Back the nut off once or twice and re-torque...it will get there. 


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#3 OFFLINE   bamashooter

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Posted Jun. 09 2018 - 07:02 PM

Definitely do something with the nut be it back and forth, a shim or two, etc. This could start a war but I'll ask; did you lube the threads on nut/ rcvr?




#4 ONLINE   MadeInUSA

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Posted Jun. 10 2018 - 07:59 AM

Back the nut off once or twice and re-torque...it will get there. 


This, its very common to tighten it then back it off a d retighten it several times.


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#5 ONLINE   ScoutnUSA

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Posted Jun. 10 2018 - 08:09 AM

I am offering an idea as well as asking a question here.

I could be wrong here, and if I am someone correct me.

If that nut is also the barrel nut and not just another nut.

BUT. Isn't the torque range of the nut fairly broad? Something like 20 - 80 ft lbs? Have you tightened to the 80 lbs yet?

 

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#6 OFFLINE   Blacktree

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Posted Jun. 10 2018 - 12:19 PM

Yes, the barrel nut has a pretty broad torque range. But if for some reason you can't get within that range, you could try shims. Use the thinnest shim(s) needed to get the job done.




#7 OFFLINE   NewARBuilder87

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Posted Jun. 11 2018 - 08:16 PM

Lube, yes, haven't tried shims, they'd put the nut too far forward from the receiver, making the handguard have a space between itself and the upper. I have also tried the tighten, loosen, tighten, etc method and got so close it hurts, but still a little short. I'm gonna throw my idea out there, knowing I'm probably gonna get chewed a new one for it, but I've been thinking about getting out ye 'ol dremmel and shaving the barrel nut 1/16th. That'd solve my problem I'm sure, but want to know why I shouldn't. Thanks again y'all, always so helpful, I don't mind any advice or critiques y'all have for me, I learn every day

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#8 ONLINE   towtruck

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Posted Jun. 11 2018 - 08:19 PM

If your going to cut the barrel nut that will put it too close and your guard will hit the upper...also if you were to do it it needs to be lathed perfectly straight and not Dremmeled. 




#9 ONLINE   towtruck

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Posted Jun. 11 2018 - 08:26 PM

My only suggestion is to lube it up with some white grease, and torque that bad boy on there. Again, back and forth with the nut if you need just a little more. The only thing I would try if that does not work is to have the receiver squared. They sell tools that you can buy that will square up the receiver and you can take a little or take a lot away depending on what you need. I would try that and take a little and try the nut again...rinse and repeat until it fits.  




#10 OFFLINE   NewARBuilder87

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Posted Jun. 18 2018 - 02:12 AM

At this point, I'm beyond torque range, it simply won't go any tighter, not without risk of cracking the receiver. I'm really almost out of ideas, disappointed I'm having such a time getting this rail installed. Now the last 2 pieces to the build, BCG and CH, will be here later today for the BCG, sometime tomorrow for the CH. If I could find a machinist with a lathe, I could take 1/16in off the barrel nut without any negative consequences, I hope? Thanks again everyone for your input, one day I'll get through a build without any issues... ONE DAY...

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#11 ONLINE   towtruck

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Posted Jun. 19 2018 - 11:13 AM

At this point, I'm beyond torque range, it simply won't go any tighter, not without risk of cracking the receiver. I'm really almost out of ideas, disappointed I'm having such a time getting this rail installed. Now the last 2 pieces to the build, BCG and CH, will be here later today for the BCG, sometime tomorrow for the CH. If I could find a machinist with a lathe, I could take 1/16in off the barrel nut without any negative consequences, I hope? Thanks again everyone for your input, one day I'll get through a build without any issues... ONE DAY...

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You don't need that much material removed. I would try lapping the receiver as you only need approx. .003" of material removed. Think about your 1/16" number for a second.....if your hand guard hits the upper now what's it going to do after you cut that nut?  The receiver threads are 18 threads per inch.....you only need about 1/32 of a turn or 1/32 of an 18th inch. 

 

If squaring the receiver did not get it there I would buy a shim kit and shim it back to the next set of holes. The gap at the rail to upper will not be big enough to care about.




#12 OFFLINE   bj139

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Posted Jun. 19 2018 - 04:01 PM

I have not seen mentioned elsewhere but I did this on my last barrel install and it worked more smoothly.

 

Put some grease on the front flange of the barrel extension where the barrel nut contacts and a little in the barrel nut where it contacts this flange as well as the threads on nut and receiver.

 

Then tighten and loosen repeatedly as others have suggested.


Edited by bj139, Jun. 19 2018 - 04:02 PM.






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