Loose Forend.

[Heff]

Funny, after snapping a pic of the forearm tape job on mine I decided to check the screws just to see. I got about a 1/4 turn on one and 1/2 on the other.

[Pa SxS]

Here is why I suggested checking the tightness of the screws.

I started shooting my grandfathers SC when I was a young teenager. I noticed that there was a gap between the barrel and the end of the forend. You could squeeze the gap shut and when you did, the release lever would partly open yet when you put the forend on, you had to press pretty hard to get the lever to snap closed. I thought, how ingenious of Parker to make a spring loaded forend. Hell, that's the way I thought it was supposed to be. As I got smarter (no comments please) I realized it was not normal and as Bruce did, I put a felt dot in the barrel channel of the forend to make it tight. The gun stayed this way for all these years until recently. For some reason, I thought to tighten the screws. Holy cow, it was just loose screws!

Now you know the rest of the story.

P.S. for you hammer gun owners, check the hammer screws. They do have a tendency to loosen up. Small thread Locktite is the answer.