It's not possible to check it easily, as one can't see the gas holes of the barrel.
There is a drilled hole pointing downwards at the end of the gas-port, and
that's all one can easily see, without removing the whole gas-port-assembly,
or using boroscope to see through the holes from the barrel - and I don't
have a boroscope. It is a new gun, so I'm not going to alter it. I just want
to know if it SHOULD work with 12/70 trap shots or not, and if it should,
then it will have warranty for fixing it. If not, I can live with using heavier
12x76 shots.
Like this cross-section, P is