Congrats.
Yours remided me of my father's P7 he got in the early 80s.
I had one but the P7M8 model which I got back in '89 but sold it around '01.
One feature that I remember about the P7s is that you could instantly fire a round after releasing your slide after a mag reload.
To do this, first if you want to practice it make sure your gun is unloaded, open the slide and lock it open with an empty mag, hold the trigger while releasing the slide with the grip cocker lever, it should fire as soon as the slide close.