The Caldwell Mag Charger Universal Pistol Loader is designed to work with almost all pistol magazines. The Universal Pistol Loader works with both single-stack and double-stack magazines and loads 9mm 10mm .357 Sig .40S&W and .45 cal ammo. This magazine loader is simple to use just drop in a round and squeeze the lever. The adjustable side shims align magazines of any width for optimal use and are labeled with numbers for quick adjustment. The lock knob keeps virtually any size magazine secure including most .380 magazines. The extremely durable polycarbonate construction will stand up to years of pistol magazine loading.