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Never know, it has happened in the past, especially with a hop up unit requiring a square tip nozzle, only to have a tapered tip one installed as an after thought to the parts order. Could be the piston O-ring as well, I went with my first guess based upon seeing different mechbox (with unknown brand of nozzle) compared to another brand's (stock, then a Systema) hop up unit........ like I said, that rang a bell and I went with it. Also assumed the mechbox had been tested by the assembler before it left the factory, I know asking too much from JG. Lol
Regarding the O-ring issue you found, ya, I'd be stretching it too, as well as trying other rings to see which would give the best compression. Airleaks such to chase!!!
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