[1k9]

How much play or movement do you have in you thumb saftey with out the hammer cocked?
mine seem to have more movement than I remember and will move up when the hammer is not cocked and prevent the slide from moving. By the way it on a S&W 1911 ambi saftey.

 

[500 Magnum Nut]

If it moves by it's self it needs work. Perhaps the pin/spring needs replacement.