Posted by David Williamson on March 8, 2017, 5:46 pm, in reply to "2E barrel hook"
That is the second style joint check. It was only on ejector guns and was shortly lived. From what I have read if the tiny spring inside breaks, you will have a hard time removing the barrels. I have a 1913 Specialty grade with that and I have not taken it apart to see the mechanics of it.