CMMG Magazine Extension Kit for FN Five-seveN 5.7x28mm 10rd, Black - 57AFD1E

This magazine extension increases the capacity of FN Five-seveN 20-round magazines by 10 rounds. It is designed specifically for FN Gen1 Five-seveN pistols in 5.7x28mm caliber and is not compatible with newer magazine versions. The extension features a black finish and adds approximately 0.5 inches to the magazine height.