I hope that there is someone out there that can help me.
I bought a S12 and did the conversion to pistol grip, stock, trigger, etc...
It would not cycle anything at first, so I read some forums and went to work. The barrel only had two gas ports, so I drilled a third and increased the size of the others by 1/32". Then I took the regulator and slightly increased the angle to allow more gas and for better alignment in #2 position.
I still could not cycle anything in semi-automatic mode. So I clipped off about 3.5 coils off the spring.
I can now cycle Winchester Super X 00 Buck-2