Ask the Community

Plastic. They last 5000 rounds or so before you should need to replace it.

Earl, it is plastic. I changed mine out almost as soon as I got it. https://shop.cz-usa.com/productdetail/0721007002_recoil-spring-set-p09-9mm-captured

its plastic but I have shot them for years and tens of thousands of round with no issues I have not seen any disadvantage to them