I'm a Ruger man.
They do not sell parts for it.The Browning 1911 22 is a smaller version of the 1911. Full size 1911 parts wont fit it. I don't know if Browning sells parts for those. I know sights are unobtainable. You may have to send it back to Browning.
It will have to go back for repairs.
MY Browning 1911-22 has a thumb safety.
No idea what the OP doesn't have one.