Butler Creek ASAP Magazine Loader Universal Single Stack 380 ACP to 45 ACPWorks with most single stack magazines Uses only one action to load magazine Made in the USA Self loading magazines are still in the future. Butler Creek has the next best thing. The ASAP Universal Single Stack Magazine Loader works with a large majority of single stack magazines between 9mm . 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 sealed, magazine loaded.