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I open the GBBR. The O-ring look great, but I change it to be sure (2 times) and the problem stay.
I analyse more in detail and it's look to be a mecanical resistance at the middle of the run (the trigger assembly looks to do some restriction, but I don't know if it's normal or not. All the rails look straight too...).
I'm looking for a complete "How To" disassemble the AK74un but I didn't find nothing complete (trigger assembly, hop-up/barrel, the nozzle).
So I'm close to the starting point again
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