Off face is hinge pin hook wear.
Loose up and down is bolt/bolt bite wear.
Loose side to side is barrel lug wear (width).
Proper fit of The dolls head and barrels being on face will usually eliminate and side to side looseness when the gun is closed.
Most guns, especially well used ones will have some side to side movement when the breech is open. This bothers some people in that "ideally" it should have little to no movement, but realistically, it is not a big deal since what is important it if the gun is tight when closed.
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B. Dudley
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