I believe Kevin went to Kings in Burbank and then into his own business of making special effect firearms for the movie business. I'm probably wrong, lost a lot of brain cells in the last 35 years.
The other gunsmith could have been Steve Alexander. A very talented guy whose main love and specialty was building reproductions of classic black powder rifles. Steve also did long gun work there. He is still working in the mid west somewhere.
I have fond memories of Harry Ruffle (worked for me in the 45 dept) Kevin and Steve setting the San Gabriel gun range on fire when Harry shot his home made black powder cannon. It was a small fire and we put it out easily. If you did not know, the prerequisite to being a gunsmith is being a pyromaniac first.