Why does my Interarms 9mm P99 trigger look different than the current 9mm P99?

The original P99 trigger design incorporated an additional safety device to prevent the trigger from being squeezed if it was caught or snagged on something. The idea was that you have to squeeze the trigger evenly from the the full trigger face, which disengaged the safety and allowed the trigger to be squeezed. This was known as the "split" trigger. Here is a picture of both sides of the original split trigger (photos courtesy of Dan Benson):

 

Walther redesigned the trigger after about 6000 pistols were made.

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