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Old April 20th, 2012, 18:51   #9
Danke's Avatar
Join Date: Oct 2007
Location: Danger Zone
On the MP7 hopup rubber swells up from silicone oil.

The fix is to change it out.

Then use less oil when lubing your mags and don't apply it to the rubber.
Airsoft, where nothing is hurt but feelings.
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