Full choke.
They are for the choke wrench most likely. Choke markings are usually on the body of the tube.
The Life and Legend of Wyatt Earp - 1955 Nineteen Notches on His Gun 2-14 was released on: USA: 11 December 1956
To determine different shot patterns
Usually suppressors can be screwed on, so there should be notches to screw it on.
Goodnight Mrs. or Miss.
it means "goodnight, kisses"
Buenos noches means 'good night'
like puzzle pieces. They have notches that fit into gaps
Notches are small cuts that are used to keep track of something or for keeping a record. They are indentation or incisions on an edge of a surface. A notch can also mean a degree or level or a narrow mountain pass.
1 notch
open = 5 notches 1/4 = 4 notches 1/2 = 3 notches 3/4 = 2 notches full = 1 notch