This is the 2 pin frame. It has a single pin above the trigger and is the "weaker" of the Glock generations
This is the 3 pin frame. It has 2 pins above the trigger and is the one that Glock, according to your origional post, will replace the 2 pin frames with.
Now as for what you are claiming..That glock replaces the old 2 pins with 3 pins I dont think I have ever heard of that especially not for free...but I could be wrong

This is the 3 pin frame. It has 2 pins above the trigger and is the one that Glock, according to your origional post, will replace the 2 pin frames with.

Now as for what you are claiming..That glock replaces the old 2 pins with 3 pins I dont think I have ever heard of that especially not for free...but I could be wrong