Try replacing the 2 front breech orings if its leaking with both bolts.
Do you have a QEV installed?Clean it also,also check the orings at the base of all your banjo fittings.
I also use a drop of super glue on my hose barbs to keep the from leaking
A good way to check for leaks is to use bubble blowing solution on a Q tip,put it around fitting to see if you have any leaks
Good luck,I have 2 mech ions,there currently my go to guns and I love them