It holds 10 rounds with it's magazine. It can actually take a full size 16 round magazine, and it has a sleeve that fits such magazines so the grip is perfectly extended. Unfortunately, such a magazine would not be legal for me. I could always get a full size 10 round mag and put a sleeve on it, thereby giving me a full grip, but its only a 9mm, so the kick is small and I figure I don't really need it.