Oh what the hell. Its raining and blowing a literal gale outside, so I might as well tell how I came to lose the gun in case someone else may benefit.
I had stoned a white sea bass of something over 30 pounds. The tip must have gone through the spine, and the fish just rolled over. I grabbed the line and pulled the fish to the surface, where I noticed that the slip tip was barely protruding maybe a half inch from the far side of the fish. The tip could not easily toggle as it would have if it had been completely on the far side, and pulling the fish up did not seem to have been sufficient to pull the shaft adapter back out of the tip. I was not concerned though, as pulling the fish to the surface had not budged the shaft and tip.
I have what turned out, at least in this case, to be a bad habit. Since I am not going to reload and try to shoot another fish before taking the previous one back to the boat, I don't bother to string the fish or remove the shaft and tip from it. I just grab it securely and swim back to the boat with the gun, and often a bunch of kelp all wrapped in the shooting line, trailing behind. I have tuna clips on the end of lines hanging over the side of the boat, and in this case I attached the fish to one of the lines, went around to the swimstep, and climbed in. I leaned over the side and grabbed the fish and lifted it into the boat, and the shaft and slip tip slid right back out of the fish and then pulled the gun down. I don't understand why it didn't slide right out when I originally pulled the fish to the surface, but anyway it sure slid right out now.
There are a few things that I could have done that would have prevented the loss. One would have been to string the fish, then carry the gun in my hands back to the boat and clip it to one of the lines. Or even without stringing the fish, after attaching the fish to a line I could have pulled the gun over to the boat and attached it to another line. However, I didn't have enough imagination to forsee the shaft falling out of the fish while the fish was pulled into the boat.
I now have that much imagination.
I've attached a photo of a fish of similar size taken the week before. Since you can see the gun with the reel in my hand, this is obviously not the offending fish.