Makes filling a magazine as easy as flipping a switch Compatible with 9mm, 10mm, 357 40- and 45-caliber mags Works with single and double stack pistols Universal magazine loader/unloader for pistols Speeds up and simplifies the pistol loading process Makes filling a magazine as easy as flipping a switch Compatible with 9mm, 10mm, .357, .40-, and .45-caliber mags Works with single and double stack pistols