SIG, Taurus, and Para Ordnance copied the Colt Series 80, the timing seems like they waited for the patent to expire.
Kimber's is a very close copy of the 1930s Colt Swartz. The SW1911 linkage is different, I have seen the designer's name but do not recall it.
They all require "timing" of the action, the hammer block has to clear before the sear releases the hammer. Not all did, but they seem to have the bugs out by now.