The KP50 feeds from a 50rd magazine, and topping one off by hand is a genuine chore. KelTec's own speedloader takes the fight out of it, seating 5.7x28mm rounds without chewed up thumbs or a creeping loss of will around round forty.Made by KelTec for its own magazine, so the fit is exact and the loader will not chew up feed lips the way generic tools can. If the KP50 is your range toy of choice, the time it saves shows up the first afternoon you bring it along.