You may want to check which frame style your new shadow 2 has.
In the first picture, the left is the older frame style.
The newer frame style on the right has some material removed just above the hole that the slide lock pin goes thru.
If you have the older style you may want to keep an eye out for cracks where the material is removed on the newer style frames.
I do not know how much of an issue this is but apparently, some people are getting cracks in that area.
I have one of each and my older style frame has 10,000 rounds and no signs of cracking.
From what I can tell by google research, most of the cracking is on fairly high round count guns, 60,000 ish. However, it is the internet and their is someone out there that says he has seen it at very low round count on multiple guns.
FWIW, I am going to continue to use the old frame and simply keep an eye out for cracking.
The internet says that CZ will warranty cracked frames, I have no way to confirm.
The picture below is not mine, I got it from the internet, but it shows a broken shadow 2 so I am posting it.
Thanks