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Old January 16th, 2011, 22:55   #6
Kuney
 
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Join Date: Dec 2010
Location: Kawasaki, Japan
From the symptom you described, I think the small spring part which makes it 3 point burst is not placed properly, or simply crashed.

If the part(which is on outer shell of mecha-box) does not work or placed properly, 3 rounds burst is going to be full-auto.

Check out the top picture of the page below, it's pointed by red circle in the pic.
If you read Japanese, you get more help though

http://masahisa.at.webry.info/200810/article_12.html

good luck!
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