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Posted: 7/10/2013 3:14:18 AM EDT
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Wondered if the Knowledge Base had any experience with the following:
Aero Precision Upper - New DPMS Freefloat Tube - Previous Build, No Issues Went to install the barrel nut onto the upper and it would only turn a little way before becoming too tight to hand tighten. I always use an anti galling/seize compound on the threads and this time was no different. Even with my DPMS wrench the nut was extremely tight and the nut was squeaking as I attempted to install it. I was concerned so I remove the nut, re-cleaned everything and tried again with the same results. Same tightness/squeaking, so I removed the barrel and tried just installing the nut without the barrel in the receiver...same thing. I didn't have a spare barrel nut of any kind so I finally I used a 1/2 inch breaker bar and DPMS wrench then would "crank" it on a bit, back off and keep going until I had it properly indexed. I have never had this happen before and wondered if anybody had experienced this. My experience with Aero has been positive and the DPMS tube was installed on another build with no issues. Either way it was very strange. Thanks, Mike |
| Same happen to me. I have an aero upper and dpms barrel. I got the barrel nut snug by hand then went to torque. It seemed impossible to turn it and it squeaked the whole time. I had grease on there as well. Although this was my first build so i have no experience on what is normal. Just sharing my experience with it. |
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Quoted:
I put a dab of slip 2000 in front of the collar on the barrel right where the nut contacts the barrel thats where it is binding, that will eliminate the problem.Any oil 3 in one, or any thin oil. This ^^^ Although I would use moly-fortified grease on the torque shoulder (as well as the threads). More resistant to "scrubbing out". |
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Quoted:
I put a dab of slip 2000 in front of the collar on the barrel right where the nut contacts the barrel thats where it is binding, that will eliminate the problem.Any oil 3 in one, or any thin oil. No, he said he had the same problem even without the barrel, just trying the nut on the receiver. ...so I removed the barrel and tried just installing the nut without the barrel in the receiver...same thing.
OP, guessing (only guessing) it was/is the nut which was possibly galled or damaged from the previous install (did you try it again on the old receiver?). I'd have at least tried a new nut. Now that you've forced it on (chasing the treads as you went it sounds like), if the barrel is secure I'd leave it. If you ever do remove that nut again, I suggest having a new one on hand (and hoping you didn't damage the threads on the new receiver). |
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Quoted:
Nope, no issues taking off the old install and yes, I wish I'd had an extra barrel nut around. If it shoots OK, then I'll leave it be, otherwise I'll tear it down and try to remedy the problem. darnedest thing.... Ah, but did you try to spin it back on the other receiver? It may have proven the source of trouble if you had. But either way, I hope it works out for you. A good lesson to others though, is to be ready to put a build on hold if something doesn't go right. Sometimes, you just need additional parts/tools etc. that aren't immediately available (ask me how I ruined an expensive Yankee Hill barrel nut on my first upper build). Sometimes, it is better to set it aside to get what you need than to press on. |
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