I have a very close copy of this pistol that was made by Art DeCamp and some very good close-up photos of the original pistol that I found on the internet.
One of the photos of the original has the lock out and shows the lock internals as well as the lock mortise. It looks like there may be a pin through the stock for the trigger. I'm a little unsure because it is right next to the hole for the sear screw.
There is another detail picture of the muzzle of the original showing the nose cap. In it, the nose cap looks like it could be one piece.
On the DeCamp copy the nose cap is two-piece. The DeCamp pistol is a wonderful piece and feels great in the hand. I haven't taken photos of it yet or I would post some of it.