So I was cleaning my rifle after a day out..... - Page 1

[ARCHIVED THREAD] - So I was cleaning my rifle after a day out.....

Posted: 5/5/2018 11:12:57 PM EDT

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After 2 weekends at the range with my rifle I noticed today a missing rail screw, boy after checking the others they they werent far behind at all! I am shocked no signs of of thread locker, so while putting them back in I put some red Loctite on them.

So my question is after using my google-fu I wasn't really able to turn up the part number and where I can order just a sight with no pics or void of thorough explanation, should I just call BM on Monday?

Posted: 5/6/2018 6:45:19 AM EDT

[#1]

Say what?

Posted: 5/6/2018 9:09:22 AM EDT

[#2]

Quoted:
https://www.AR15.Com/media/mediaFiles/37149/2B4EE7E9-B5C4-415E-90BF-1BD92818B374-535230.JPGAfter 2 weekends at the range with my rifle I noticed today a missing rail screw, boy after checking the others they they werent far behind at all! I am shocked no signs of of thread locker, so while putting them back in I put some red Loctite on them.

So my question is after using my google-fu I wasn't really able to turn up the part number and where I can order just a sight with no pics or void of thorough explanation, should I just call BM on Monday?

View Quote

I would definitely call the maker to get the screw or the identity of it it if it can be sourced at your local Fastenal.

I would loctite and get a couple spares. It seems there is a bit of slop going on.

Posted: 5/6/2018 9:14:23 AM EDT

[#3]

I would pull one of the remaining screws, make sure it fits the the missing spot and source one locally. And buy a few spares too.

Posted: 5/6/2018 10:21:49 AM EDT

[#4]

I remember this being a thing when I first got my ACR around 2011. Everyone recommended loctiting all of those screws before using the rifle. Didn't realize this was still an issue.

Posted: 5/6/2018 1:26:53 PM EDT

[#5]

As you can see they are like fly shit, pretty sure they had them made to fit the need. They are 8x32's so I purchased two longer ones and cut them down to length, just going to touch up the cut ends with a little cold blue and i should be GTG.

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Posted: 5/6/2018 1:43:32 PM EDT

[#6]

Quote History

Quoted:
As you can see they are like fly shit, pretty sure they had them made to fit the need. They are 8x32's so I purchased two longer ones and cut them down to length, just going to touch up the cut ends with a little cold blue and i should be GTG.

https://www.AR15.Com/media/mediaFiles/37149/C2791AB6-BBE4-431B-8355-993E09814A51-535558.JPG

View Quote

Looks like rather minimal number of threads engaged per screw. No engineer, but I doubt that's approved practice. Take a look inside, and see if making some screws with a greater number of threads engaged (longer threaded portion) is possible. If so, make some, test, and loc-tite. Don't forget to clean all the threads, both on the screws and the internal threads with some solvent to remove any traces of oil that would interfere with the loc-tite. Pipe cleaners are good for the internal threads.

Posted: 5/6/2018 3:51:33 PM EDT

[#7]

Possibly the most pathetic fasteners I have ever seen.

Posted: 5/6/2018 3:54:26 PM EDT

[#8]

Quote History

Quoted:
Possibly the most pathetic fasteners I have ever seen.

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That's pretty bad. Wow.

Posted: 5/6/2018 7:17:23 PM EDT

[#9]

8/32 can be cut on wirestrippers.
the first few threads do 90% OF THE WORK IN a nut / bolt fastening system

Posted: 5/6/2018 7:29:24 PM EDT

[#10]

Quote History

Quoted:
8/32 can be cut on wirestrippers.
the first few threads do 90% OF THE WORK IN a nut / bolt fastening system

View Quote

The good news is there is not much WORK TO DO in that application.

Posted: 5/7/2018 11:23:38 AM EDT

[#11]

I’ve stripped out Allen keys before I’ve stripped out the threads on either side of these. Generally I end up drilling them out if I’m replacing my internal rails since I use lots of blue locktite on them when I reinstall them

Posted: 5/7/2018 11:53:45 AM EDT

[#12]

Quote History

Quoted:
I've stripped out Allen keys before I've stripped out the threads on either side of these. Generally I end up drilling them out if I'm replacing my internal rails since I use lots of blue locktite on them when I reinstall them

View Quote

I was worried about that and was very cautious with tighneting them. If you strip the rails all you can do is drill them and bump up to a 10-32 or repalce the rails.

Posted: 5/7/2018 12:35:45 PM EDT

[#13]

My ACR had a screw loose too.

Posted: 5/8/2018 5:12:18 AM EDT

[#14]

Same screw came out on mine.

Called Bushmaster back in the summer. They shipped several replacements at no charge. Took about 5 mins to resolve the issue.

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Posted: 5/8/2018 5:46:45 AM EDT

[#15]

Quote History

Quoted:
Called Bushmaster back in the summer. They shipped several replacements at no charge. Took about 5 mins to resolve the issue.

View Quote

Awe, you're no fun. We want to bitch on the internet!

Posted: 5/8/2018 12:18:37 PM EDT

[#16]

After the first few packets of screws went out, I would have imagined that the person(s) installing this fastener would have been instructed, in no uncertain terms, to use loc-tite when doing so. At least this is a non-critical failure, and apparently addressed with common repair parts sourced locally.

[ARCHIVED THREAD] - So I was cleaning my rifle after a day out.....

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