The ASAP Universal Single Stack Magazine loader works with a large majority of double stack magazines between .9mm - .45 ACP.The ASAP universal single stack magazine loader works with a large majority of single stack magazines between 9mm to 45 ACP. Fill magazines with one action push the mag loader down, insert the round below the feed lips, and raise the loader up. Bullet seated, magazine loaded. Just like that. Features: Uses only one action to load magazine Made in USA