Decent but priced high - Anarchy Outdoors CZ 457 Bottom Metal

This helps with quicker mag changes during a match and also stopping you from bumping your magazine release if you're using an extended one. My only complaints are with the quality control. My action screw holes were not drilled out wide enough for my cz457 pro varmint and I had to drill them out myself which wasn't bad. Then the extended magazine release that shipped with it didn't have the recessed hole for the spring to sit in drilled out hardly at all. I ended up not even using it bc I already had the paddle polymer version. It definitely makes mag changes quicker and feels way better than the factory though.