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Yes, 3.8 to 4.0 mm The shop guy told me that the power reduction is only due to port size, everything else should be the same 

Hi, Sorry for the thread resurrection. I have the same restricted gun bought in Portugal. Guys from the store told me that the optimum port width is 38mm, and 40mm max. I can send you the guide... I have a question regardless, knowing the width,h deep should I drill the port?