I had this problem as well. I had to file the top of the safety bar cutout where it engaged the sear. I hit it with a fine file for about 10-15 passes then reinstalled it, I was able to see and feel a little more upward movement toward engagement. I hit it about 5 more times with the file and then some 600 grit sand paper. Reinstalled and I had positive engagement with a tactile (although gritty) and audible confirmation, function check was satisfactory. I removed it, polished it up with some 1200 grit sand paper and a light coat of CLP. Reinstalled, function tested and packed her for a day at the range tomorrow.