I purchased one and installed it on my G2C fit well but I found that after firing several rounds it loosened up. Come to find out the screw for the mounting plate which came from the original screw for the original sight was the problem. The manufacture of the red dot sight does not provide a screw and the original screw is made only for the original sight will not tighten enough to secure the red dot sight no matter what you do. Now I am stuck with two red dots that I can't use on my two G2C...what you need is a 22 Competition Red Dot Mount Screws 6-32
It is a red dot, not a magnifier.
To mount the ADE Advanced Optics Zantitium PRO Series Red Dot Sight to your M&P Shield 380 EZ, you will need to purchase and install the Evolution Gun Works Vortex Viper/Venom Sight Mount. This mount will replace your rear sight with an adapter plate, allowing you to install this optic. The mount can be found by using the link below:
https://www.opticsplanet.com/evolution-gun-works-vortex-viper-venom-fits-burris-fastfire-and-docter-1-811-in.html?_iv_gun-model=smith-and-wesson-m-and-p-380-shield-ez