I have the same issue (double feeding) with my g&g gr16 m4. I use a mad bull ultimate hop-up. With the original green hop up rubber that come with the g&g. The blue one that come with the kit was unable to fit.
The barrel is a prometheus 6.03 500+mm and a full bore up kit in the gear box.
What should I do?
EDIT: gr16
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Last edited by sebdark; December 26th, 2010 at 23:28..
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