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Service Advisory - Loose Top Rail on Receiver

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#21 IHB97



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Posted 19 February 2012 - 04:42 PM

Where could I get these shims at?

#22 gcw360


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Posted 19 February 2012 - 06:03 PM

An Airsoft store.  They are gear shims.

#23 Disrupter911



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Posted 18 April 2013 - 03:07 PM

What exactly are you using for a spacer in that picture?
nylon washer from home depot or somewhere?

guess I should read until the end of the thread. gear shims it is!

#24 msgall2003



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Posted 11 January 2014 - 03:47 PM

Yeah, I suppose this could work.... sort of. I notices the same issue on my LM4C. My fix is a bit more permanent however. Since upper receivers are relatively inexpensive, I chose to just remove the rail and apply JB Weld to all of the contact areas. I cleaned everything with some rubbing alcohol and then carefully applied the compound in the channels on the underside of the rail where it meets the two upper receiver halves. Then I reassembled everything during which I carefully pressed everything together to squeeze the excess amounts out, drove the roll pin in then used q tips, toothpicks, and paper towels to remove anything the squeezed out on both the outside and inside. Then I used some zip ties to keep everything nice and tight together until it fully cured.

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