Vulcan 3 leaking air

Now to clarify. I depressurized the gun to adjust the reg. Upon reassembly it now leaks air from the vent hole by the regs position. The regs o rings are on both sides of this vent hole. It leaks either cocked or not. What am I missing?
One of the o-rings n the outside of the reg is cut. I had the same thing happen and I know of one other case. Easy fix.
 
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