Before ordering a new screw, can you try adding a washer as a spacer?
Filing the original screw is easy and takes maybe 5 minutes. Or use a Dremel w/cutoff wheel and finish it off with a file......even faster.
Then he can't send it back.
You mean to tell me you can't buy a replacement front action screw from Kimber?
ETA: Per the 84M manual, a new front action screw could be ordered.