Originally Posted by Danke
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.
I did a bunch of research before purchasing the gun. I am aware of this issue and only put one drop of oil on my propane tank before installing the nozzle. I highly doubt my bucking is swelling when I have only put 4 or 5 magazines through the gun. Would that cause double feeding anyways? a BB always fires, none ever get stuck in the barrel, just double fed for some reason.
I am going to try some BB Bastards tomorrow and hope it solves the problem.