The Caldwell Mag Charger Universal Pistol Loader works with single- or double-stack magazines to load 9mm, 10mm, .357, .40 S&W, 45 ACP, and most .380 ACP ammo. The Mag Charger is constructed of durable polycarbonate, and is simple to use just drop a round in and squeeze the lever. Works with single- or double-stack magazines Loads most auto pistol cartridges Durable polycarbonate Simple to use