I'm not sure what the sound may be however I have had alot of times where putting a new hop rubber causes jams. Mostly in VFC hop units but some LCT as well as aftermarket ones. Try putting a bb into the hop up and barrel assembly and see how much force is needed to push the bb past the hop rubber. Could be as simple as selecting a different brand or hardness of rubber.
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Originally Posted by m102404
Hectic....FFS start writing in coherent sentences!!!
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Quote:
Originally Posted by JDoorn
Thanks Hectic,
While your posts are sometimes a difficult read, you sure are helpfull 
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Lvl. 3 certified sniper
FinchFieldAirsoft
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