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 XM177 buffer tube worn out threads (solution)

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S. Thomas
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PostSubject: XM177 buffer tube worn out threads (solution)   Sun Jul 26, 2015 12:28 am

Anybody ever had any issues with worn out threading on their Marushin XM177/M16 buffer tube? Took apart an XM177 today and while putting it back together, I must have ruined some of the threading on the buffer tube. When I pulled the charging handle back, the whole stock flew off and hit me in the chest...I was only able to properly secure it again by screwing it further into the receiver so the remaining "good" threads engaged. However, this meant the butt stock stuck out at a silly angle.

To fix it, I wrapped the worn out threading with a single layer of electrical tape. I was then able to tighten the buffer tube at the correct angle and after cocking the gun a hundred times throughout the day, the buffer tube remains securely in place. Hopefully it stays in place now because I dare not unscrew it again and I'm curious if it holds up after firing. Just thought I'd share this in case someone else has the same problem. Smile
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Cerwyn
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PostSubject: Re: XM177 buffer tube worn out threads (solution)   Sun Jul 26, 2015 10:42 am

The buffer tube and receiver have such a fine thread it's all too easy to cross thread the buffer tube when screwing it into the receiver. 
Hopefully your "quick-fix" will hold but long term it could be worth looking for a new / used Buffer Tube and Receiver with good threads.

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smootik
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PostSubject: Re: XM177 buffer tube worn out threads (solution)   Wed Jul 29, 2015 9:41 pm

Perhaps silly question, but is part F117 still in place?
It is supposed to prevent the stock from screwing off, without it the tube tries to disassemble itself.
http://mp40modelguns.forumotion.net/t2897-marushin-xm177e2-kit-first-time-assembly#17965

If not, I suspect you are right. Threads are fairly soft, and I can easily imagine they get stripped Sad
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