I'm not sure I would spend that kind of money for a pistol without personally
inspecting the weapon. My model K S&W has worn parts that are very hard to
find, if at all. The trigger assembly must be taken to a machine shop for
adjustments that cost more than the original replacement part that cannot be found.
I would also check the availability of parts.
I may anyway. ☺
Actually it is called a Lanyard Ring.
Its purpose of the lanyard ring is to attach the fire arm to your person with a chain so that if it is dropped in battle it can be quickly retrieved and preserve the owners life.