That is correct on the screw. I'll check with Dennis and in any event I'll be back in his shop at some point to pick-up another gun and we can check. I purposely do not have a good set of screwdrivers so I'm not even tempted to start taking things apart....I know how it will end up.
I'll give an update (my guess is the locks match the rest of the gun). Someone was into the gun at some point as the firing pin was missing.
Responses are not allowed!