Standard 3 Dot Sights

All P7s come standard with 3 Dot sights.  The original P7 sights were installed in the dovetail in the slides and secured with a large screw in the rear sight. 
Early P7 M8 models also included a tiny pin to secure the front site in addition.  The P7 rear sights are shorter than the P7M8, M13, M10 and K3 sights. 

These K3 sights have the front pin to secure them