I have converted more than 110 S-12 (w/BHO lever) and never needed to grind/file the safety lever or hammer/trigger until yesterday, just came across my 1st problem when the safety lever would not move over the rear of the trigger to engage the safety. The problem was due to the factory cutout on the receiver for the trigger - the front edge of the receiver cutout was preventing the trigger to rock back/reset, to the set position and the safety lever was too long to engage the trigger. one fix is to shorten the safety lever which is the easiest, what I did was to file the front edge of the rec
