The safety must be fit to the pistol. It is not a drop-in part.
If your thumb safety is "not reliable", get thee to a pistolsmith forthwith.
I would put mine up against any other stock 1911 with regard to accuracy, reliability and safety anyday.
I'll take you up on that challenge.
And I'll even let you pick which one of my three stock 1911s that I get to use. (S&W 1911, STI Trojan or Kimber Stainless Target II).
Let's see if you have the parts to 'put your money where your mouth is'.....



























