Decocker Question

I’m sure some of you saw my picture of my new 75B yesterday. The question I have is the display gun in the store had a decocker equipped/installed so why does mine not have a decocker installed or in the box? Am I missing something? Also looking in the OM it seems to say that the 75B doesn’t have one at all but then why did the display have one?

(Sorry if there is any confusion in this post I am too confused)