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On my Ak hopup, I can insert the hopup bump after the hopup tube is installed by removing the hopup pressure lever (?) first, inserting the bump under the lever and replacing the lever...would this help him out if he has a different hopup?
I too have hopup troubles...but I am pretty sure the rubber tube is dying as I see rubber residue in my inner barrel after firing...problaly need a hard rubber houp.
But as a result of MY issues, I have spent a wee bit of time becoming familiar with my hopup unit. So I am doing ok.
Hope that helps a bit with your troubles.
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