Saf-T-Lok is a rubber-style grip for your M-1911, with one major difference. It incorporates a locking device, which prohibits the usage of your pistol, if you do not know the locking combination. I am not sure if this is a solution to a non-existant problem or not, but anyway.

Additionally, the same company is producing a new magazine, which includes a locking device. Unfortunatelly, it is not made for the M-1911 (or at least, until now, no model has been announced for the M-1911).