Magpul’s PMAG Minus 5 Round Limiter is compatible with 10, 20, and 25 round Gen M3 PMAG bodies, and is designed for sporting and hunting applications. It easily installs without the use of tools, and is a non-permanent upgrade. Once installed, it reduces the capacity by 5 rounds. Magpul Industries Minus 5 Round Limiter for Gen M3 PMAG AR/M4 10/20/30rd Black Magazines (3) Pack MAG285-BLK